Could make a difference in the long run.
For instance I could imagine MS/Asobo not investing into NVidia specific tech like DLSS.
Optimizations for rasterized performance will likely benefit both NVidia and AMD.
If they do optimize a lot for AMD RDNA2 announced features like FidelityFX, that might come to benefit Radeon cards more.
It’s all pretty much guesswork though, so I wouldn’t let these speculations guide your purchase decision too much (especially since NVidia still holds (and will most likely remain) the largest GPU manufacturer for a while.
I’m just happy there’s finally some serious competition in the GPU market, only good things can come of this.