The good coins will definitely stay around
Yes, I'll not argue on that thing. As these forks are being implemented and it's a continuous process of making another split coin from bitcoin they won't stop. But those alt coins that has good name and has good market cap will stay.
why do people think everyone wants to get into crypto through a 7500 dollar bitcoin?
The way people think right now are into the profit, many did just ignored bitcoin before and are focusing with alts and when something happened to alts and it keeps on crashing they found hope to bitcoin. They don't care about it's price as long as they can recover and have profit, that's what really matters for them.