What would the implications be for ethereum-based cryptos (like Polygon, just for one example) if Ethereum 2.0 rolls out successfully?

I'm new to understanding crypto in general but what would be the technical and financial implications for ethereum-based coins if Ethereum 2.0 rolls out completely and successfully? (I'm talking in like 2023 and beyond if ETH scales 1000x like the devs hope.) It seems as if systems like Polygon are sort-of doing with L2 chains what ETH 2.0 hopes to accomplish.

Would a successful rollout of ETH 2.0 bolster sidechain technology like Polygon or would it render such scaling solutions redundant and obsolete?

Sorry if this is a dumb question but this is something like I feel is basic and I should know.