There are many applications for BTC ETFs and some for ETH. There is no guarantee these will be approved. It’s just a strong narrative that drives prices atm. There is no SOL ETF to my knowledge, but ofc that could happen one day.
It’s likely that all of crypto will get a pump from this. An ETF would be a highly regulated investment vehicle for normies and it’s projected to drive a lot of liquidity to crypto. It would legitimise crypto in general.
BTC holders will take profit after the approval and they might rotate into ETH as the next strong candidate. Gains then usually trickle down into alts, which is where SOL could catch a bid.
Ok so now we’re making investment decisions based on „someone famous holds the coin“