They're doing what the republicans wanted. GOP was blocking every single appointee "just cause". They wanted the dems to use the nuclear option so that it's long in place by the time they get back to power. Shrewd move on their part. They'll use it freely but can now always say "we didn't start it".
The nuclear option shouldn't have to have to have been used like this. The filibuster has it's place but not to block every single insignificant administrative appointee. The opposition should have a limited number of blocks they can use and once those are up...too bad. The filibuster should be there for the important stuff.