Noob question: what stops the btc->bch transition from happening again?

I'm only just getting into crypto, and I was frustrated with the transaction time & fees of BTC.

SOmeone recommended BCH, and I went down the rabbit hole of why the split happen.

What stops another split from happening again down the line?

Wouldn't bitcoin cash become as prohibitively expensive as bitcoin to transact if it grows, needing another increase in the block size, with something like bitcoin SV?