ETH actually also have the same thing going on we know existence of staking programs or restaking programs comming from the many new projects such as zircuit, stakestone, etc the advantage of some projects these days around is that they support omnichain meaning regardless of whether its EVM based, or any other blockchain they can support, so the benefit you mentioned from sol isn't necessarily doesn't exist for ethereum.
moreover, the narrative of meme coin already switching over to base i guess maybe because warpcaster devs are creating all their thing in that blockchain maybe because its more suited in the ecosystem, doesn't mean there will be no meme coin that gonna be emerging from sol though but probably its already diversified across the two blockchain added with ethereum on top of that.
so basically you can be holding ethereum and solana and get the same benefits there's nothing that you gonna miss out here.
New projects can't win if they won't come up with a new feature. The idea is to grab a couple of them and reap the benefit that entails with them. Meme coins are only meme coins but it's interesting on how they are being picky with the network that they will get deployed. If they are serious as this, it would be better if they don't create their project under meme coins.
It's okay if there will be no meme coins in the established projects because it only affects their reputation. Each crypto has their own charm, this is why you can't get the same benefits on ETH and SOL but we can have them both so that we won't miss out the other.