Already being a PC gamer you are aware of the downsides and extra headaches the PC can bring. Be it driver, software or hardware related.
You seem torn by two very different gaming aspects sir.
Moving away from PS4 for a moment, it is fantastic that Microsoft are throwing their AAA onto PC with same day release. Additionally with the buy once play anywhere feature being a bonus it is a factor that is bringing back more console players to the PC platform (I'm an example) as is the desire for 4K HDR gaming with native resolutions, max or close to maxed out visuals that are beyond the console experience.
The recent issues with Windows 10 Store and Horizon 3 / GOW4 with downloading/installing the games is an example that things are still not yet perfect. Although its fair to say with a 980Ti you could already being enjoying both of those games playing them now better than they will be even on Scorpio in over a years time. Sony may be trying to do the same with the PRO in giving customers the choice of higher tier/experience from upcoming titles but really just how many games are going to have the improved resolution and textures yet still maintain 60fps? Or will we see similar framerates to the 1080p standard experience? Bottom line yes to play Sonys AAA in the best way will be with their PRO and a 4K HDR tv.
Microsofts move on the other hand for their own AAA means PC gamers have the option to play/see the games at their best possible visual performances
and achieve the 60fps preference the console will fail to deliver on in many titles, if of course you have the appropriate hardware its possible.
Really PS4 is relying on its own AAA with much of it still to come, although to be fair many of the best console games are multiplatform anyways and the PC gradually will see more of the titles appearing also with HDR which really brings me to the advice I'd give.
You could hold off till Jan sales or get an idea from CES when next Springs HDR 4K TVs are revealled. Chances are good models will offer improvements and do so at reduced prices. Their is no reason why a 50" HDR 4K model with higher nits and better response times wont be available next year for around £600+ and like always happens give a model 3-6 months after release and they can be found discounted. Top models this year like the Samsung KS8000 or KS9500 will be found greatly discounted, it happens every year. Better I think to wait and get a UHD Premium Certifired or model that can fully produce the HDR effect as one that only partly can achieve it like many current mid range models this year do unless you do decide to hold off and get one of the better models this year in the sales.
Truth be told you coud easily be enjoying many PC games and at least Microsoft AAA from your sofa on a nice screen with XB1S Bluetooth controller for a "better than console" console type experience. Shield TV was announced at a dev conference earlier this year to support over LAN 4K and HDR. I dont know yet if this is fully working with (Shadow Warrior2) as it is the first such title.
Dont forget
Ultrawide Gaming IS possible on 4KTVs you have the option to play in native 4K, 1080p resolution or custom options.
Horizon 3 and GOW4 are again two recent examples supporting 21:9 that you CANT do on CONSOLES and no doubt BF1 will be another that allows you to get either a good
"4K Native type experience" or setting custom 21:9 resolution like 3840x1620 (similar to LGs new 38" Ultrawide) that will help the framerates and still be higher resolution than a 3440x1440 gaming monitor costing £1000. Of course it depends on your priorities, the TV likely will have much better image quality espically with HDR and potentially V-SYNC at 60 frames. The downsides being at the cost of higher response times and lag which the monitor of course will always provide with the potential for G-SYNC and smoother frame rates.
For me I see 4K HDR TV or future monitor sales being to more peoples interests than VR as it offers a broader appeal and usage of greater content.
Now if only next year we had low response time 4K Tvs or monitors with HDR and supporting upto 100Hz.
Xbox AAA titles @ 21:9 on 4KTV is the current best
console gaming experience, err on PC
The community should push Microsoft to release HDR patch for PC and its likely to happen
Console experience is fine but so much nicer/better is possible
Just keep investing in your PC & go for a massive screen. 27" is pointless just go for a 4K 43" when OCUK get it back in stock.