Monero is still listed in Binance and Kraken (very popular exchanges).

There's also TradeOgre (no KYC needed) if you wanna exchange XMR for BTC or vice versa.

But yeah, I agree that if BTC became like XMR, it would be delisted by many exchanges, which means less trading volume, which means lower price.

It's probably the same reason BTC devs don't want to adopt an ASIC-resistant algo. ASIC mining makes it harder to mine for the average joe, so it becomes more scarce and thus more valuable.

During the CPU/GPU mining era it was a lot cheaper, since you could just do it with a regular PC.