There's another angle to it post-license-change: AWS Cockroach continues tracking the latest release and pays a licensing fee for the privilege of doing so. Your costs to use it might go up a tiny amount, but AWS would likely eat most of it, and, bonus: CockroachDB's development gets more funding.

It's hard to put a price tag on knowing that an open source project your business depends on is well-funded enough that it's unlikely to disappear or be difficult to support.