Massive adoption of BCH for the whole world, imo, is uncertain, but would be good as long as BCH can remain permissionless, decentralized, low-fee and powerful, fixed-supply money.
This would eliminate enormous waste of resources currently being spent on intermediaries in the whole global economy. That money would flow to more productive uses.+ with sound money - crypto like BCH - people can start to build up savings without banks taking their money out of their accounts (through various charges) & being hurt by inflation.