5120*1440 is fewer pixels than 3840*2160 (4k/UHD). If you have a setup that can run games at 4k, they will run faster at this display's native resolution.
I still wouldn't want one for gaming, but that's purely because I don't like the aspect ratio and don't think I'd want another 60Hz display at this time with all the compelling 120Hz+ displays out there.
I only play ED and don't think i can handle VR. I have a Dell curved 34" moe and it works great with ED. My son has the Dell 38" 3880X1600 curved and that's an awesome monitor as well.
I've looked at 49" monitors in a store, but the low resolution makes them unusable for me compared to the Dell offerings. If Dell pushed the vertical resolution up to 1600 or 2160 I'd be even more tempted, but I see no reason why ED wouldn't do well on the 49" - ED doesn't need a lot of GPU. I've also looked at the Dell 43" 4k, but doesn't quite feel right when i look at one.
Hopefully the 49" will come to MicroCenter pretty soon so I can see it live.
Large curved seems the way to go for those of us that don't adapt well to VR. Fortunately we're starting to see some really good options coming out.
Yes, I'd like seeing more of these at higher refresh rates and with G-Sync, but at least it looks like things are heading in the right direction.