I think the crew vaccination is a harder hurdle than it sounds like.
Most of the CMs come from places where vaccines aren't happening. Vaccine access in most of those countries is hard even for their richest citizens.
For a line to get all their crew vaccinated, they will have to bring them somewhere (probs the ship?) where they can get the shot. Unless they get their hands on some nice Janssen, it's a 6 week process to full vaccination (jab, 4 weeks, jab, 2 weeks); they also need the government to be playing ball with them to provide vaccine, generally speaking.
So they would need Florida to go along with this vaccine mandate, getting them supply. While I think Florida could give them supply to do this, is it in line with the Gubernatorial posturing?
Vaccine has super-tight export control, so I wouldn't expect them to be vaccinating crew and doing quarantine in Pakistan or similar. And forget India - RCCL has cancelled India crew contracts because of the travel bans. No one will let them in right now and it's not expected to change for a while.