It hasn't taken 8 months to add DLSS into wolfenstein, they could have done it earlier. They delayed it because they were building DLSS 2.0 and once it was finished they went ahead and released it in game.
DLSS 2.0 fixes basically all the complaints from last year. Blurry graphics? Nope looks like native OR better. Only runs at certain resolutins? Nope now runs on everything for every RTX GPU.
As pointed out, DLSS 1.0 and 1.5 required a lot of manual input from the developer and if they want to upgrade to DLSS 2.0 they need to go back into their game code and remove all traces of DLSS 1.0 and 1.5.
Once thats done Nvidia can add DLSS 2.0 via a driver update.
I don't see it happening, DLSS is 2.0 is going to be forward facing - Nvidia said DLSS 2.0 profiles will be released in game ready drivers, which kind of implies for new games on release day rather than going back and revisiting older titles. Developers in any case won't go back on their old games now to rework DLSS.
It actually makese sense that DLSS 1.0 and 1.5 was pushed upon RTX2000 owners to beta test. This was Nvidia's plan all along - they knew adding raster performance would be hard since their dies are getting ridiculously big. And they figured it would take time, but they could make an AI system that would give generational performance boosts without negatively affecting the graphics. It took longer than expected but they did it and now with DLSS 2.0 ready to roll RTX3000 is ready for prime time.
AMD has always had driver issues, but yeah why not it would make sense that Navi is just a beta test for AMD's driver team. Thanks to 5700/xt owners for beta testing those trashy drivers