If you think that would destroy nvidia you're selling them quite short. Other companies in the market are following that exact business model: Don't produce your own boards, actually document the hardware / have FLOSS drivers.
If you're an nvidia fanboy making nvidia compete on a level playing field by making them play fair sounds of course like a disaster, but you come here and throw national interest into the mix. How the fuck would nvidia losing market share to AMD damage US national interest it would strengthen its standing by having independent options.
It might even enable Intel to secure their foot into the market, remember, the only one among RGB to actually produce their own chips. In the US.