My employer tried to move off them 2 years ago and didn't manage it.

The problem is the year subs. To avoid wasting money you need to do it at the end of a year, but you also need to get your users trained up before the switch. We hit a complication and ran out of time and so had to re-up.

Surely the cost of the subs is trivial compared to the cost of training users etc?

I could see if you were a big company, trying to migrate a bunch of users and retrain them on a new password manager would be costly, there are probably admins out there looking for any reason not to make the move, but at this point, I think they have lost all credibility.