I am heavily aroused by this. They all can sing, and sing well (except maybe Lana). At this point, we all agree the show needs to end so who cares? Just do a musical episode! I love it. At the very least, it will be extremely entertaining to watch them try and pull it off.
I will say I think it would be much cooler if there was a reason they all started to sing as opposed to just randomly having them sing for an episode. Ariel’s influence comes to mind. But I just can’t think of a good reason why people would be breaking out into song all of a sudden unless there was some sort of curse but no one really wants to see another one of those.