43 inch can be an ideal size for many genres of games, racing, space sim, 4x, RTS, odd simulators (farming, truck driving, etc).
It would be less ideal for an up close usage for saying FPS where your view is hyper focused on the middle area of the screen relying on your peripheral vision, which in this case adding way more screen reduces your chance of spotting something you normally would as theirs more information to process for your brain.
I think it's a worth while investment for a certain audience. Im just glad LG finally made it, it'll give the market more time to introduce more OLEDs and hopefully drive pricing down.
With that said I think miniLED will probably be more abundant in a short period of time compared to OLED.