Personally I don't get all the hoopla with a "smart TV". I have one and yes, I can use apps on the TV, but honestly if you have a modern Bluray player, Xbox One, PS4, etc. then chances are you also have all the same (and probably more) apps on those devices as well. One advantage (or disadvantage depending how you view it) is that when hooked up, they can auto download updates. I'm kind of picky and once I get my TV settings adjusted, I don't want auto updates.
All my devices (bluray, Xbox one, cable/dish box, etc) hook to my HDTV with HDMI cables. I then run an optical cable back to my audio receiver for dolby sound. Some prefer to run all their devices to their audio receiver first, and then simply run an HDMI out to their TV for the picture.
At our new place, the previous owner had the builder run speaker wires and I have to say I freaking love it! Before I fought with running/hiding speaker wires and sometimes had to sacrifice on speaker placement. I haven't tried the wireless speakers, but last I checked options were limited and prices were $$$. IMO, it's a no brainer to install speaker wires during construction of a new home when nothing is in your way. In my case, it looked the wall puked up a whole bunch of speaker wires and it was messy. I went in and made a speaker connection plate on the wall w/ labels, etc. Then I made some custom wires to run from the wall plate to my audio receiver which makes it easy to connect/disconnect them, plus they look very good as I used some "braided hose" type material. For the wires out of my ceiling, I simply added plugs and the braided wire covers to clean up the look a bit. All this would have cost me hundreds of dollars had I bought it pre-made, but instead I bought all the pieces from Monoprice and eBay for less than a hundred bucks.
Those issues being addressed, let's talk about coaxial cables. Knowing how you plan to set things up will help you decide how many lines is needed. For years I have used Cox for my TV and cable internet services. And I like to have my cable modem & router near my TV so I can run hard wires to all my devices (smart TV, bluray, Xbox One, etc). When using Cox as your only provider, it's easy. Only one coaxial cable is required. Then a splitter takes a line to your cable modem and the other goes to your cable box. Once the cable modem is fed, you then use an ethernet cable to feed your router. Most routers have 4 wired ports on them and newer units also have wifi built in. If you need more than 4 wired ports, you can run an ethernet cable from one of the wired ports of your router to the input of a network switch. Switches are more or less splitters for ethernet connections. Running a setup on wires keeps all your video streaming fast and without complication.
At my new house, I have a vaulted ceiling in my living room and only 1 coaxial line behind the TV. When we moved in I decided to use DirecTV for television and Cox for cable internet. To do this, I needed 2 coaxial cables, one for each provider. The problem came in that I had fire blocking all throughout the wall I needed to run a new wire down. Due to the complexity level and expense involved I opted for an alternate solution.
I moved my cable internet to my home office (about 30-40' from living room). I setup a new Asus router as the main wifi router. Then I bought an Apple Airport and placed by the TV and other A/V equipment. The Airport connected wirelessly to the Asus. From the Airport I ran an ethernet cable to a Netgear switch, and then ran hardwires from the Netgear switch to my various devices. Essentially all my stuff was wireless in this configuration and it worked pretty well honestly.
Just recently we switched back to Cox for all our services, and I moved the modem & router back by the TV and have everything hard wired again. I personally prefer this method, and I was cleaning up/removing some of the things I didn't need it became obvious there were lots of areas where things COULD have went wrong. Thankfully they never did for me. Another factor is I occasionally game and getting the fastest zero latency connection relates to zero lag and faster/more accurate game play on shooter games like Call of Duty.
So a lot of what is "right" will depend on your own preferences and how you plan to set things up. I agree that wireless technology is getting better and faster; however, a wired connection is still my preferred type when possible. For general computing, I've been on wireless for several years now. We only have laptops in the house and I can't imagine having a desktop again. Of course our tablets & phones are wireless as well. Some people run media servers at home that would warrant a hard wired line though. I'm not one of those people thus far.
We've been on cell phones for so long, I put almost zero value in land line phones. However, many consider that very important. I wouldn't go crazy on that end. Maybe wire 2-3 locations and then use a base and wireless stations to cover the other areas.