Well, the acceptance of Bitcoin Spot ETF created this "If Bitcoin gets accepted, so altcoins are" kind of mindset, and it created a domino effect towards other altcoins just as I expected.
It started with Ethereum, and now others are speculating about the next one to get accepted. Solana is the rumored next, but I doubt that it will be. As for XRP, it will be one of the top altcoins out there for a long time, but I don't think that a spot ETF for them will get accepted, Heck, I don't think that it really needs to be created at first place. I mean they just had problems with SEC a few months ago and many are speculating about a potential Spot XRP ETF already.
For me, I guess Bitcoin and Ethereum are enough already, and although SEC can just accept any Spot ETF that other companies will file, I don't think that it's necessary that a Spot ETF for many altcoins will be created.