Part of the Saga announcement was that they are delaying the start of cruises until May. They had some booked for March and April, now cancelled.
As for the danger of allowing them to leave the ship, could still pass on the virus etc.... while this is true, the risk is very low.
Some people might isolate for eternity (if they can) as long as there are any Covid cases anywhere. I think most will be ready to take advantage of things opening up once they have been vaccinated, even though the risk to them personally is not zero.
That’s certainly how I feel. I’m just getting over Covid. I know I’m not guaranteed to be immune now, but the risk of me catching it a second time is much lower than the risk of me catching it first time. So when cafes are open, I’ll be in there, although I only chanced it a couple of times during the summer and Autumn.
Oh, and if anyone is going to say “see, you went in a cafe twice and caught Covid!” I caught it from DH and he caught it in the care home where he works, despite PPE.