My 2 cents from the sidelines:
Seems like a pretty big ask, especially when you consider the likelihood that those 3 players will play every turn from now on. If 3 of them already missed 3 turns in a row, what's to stop it happening again? Clearly there must be some sort of lack of interest on their side that caused the missed turns, or else they would have checked in much earlier.
But if it keeps the game going, I guess there isn't much of an alternative...