Just to be clear about something,
The Supreme Court does all it can to be as quick as possible. It's just extremely when basically 1 SC deregistered, an another one is missing, and an another one recused himself. We are 2 and we're not intentionnally waiting because "it's funny to have no president xD". It's just extremely difficult to end up having a ruling when we are only 2 and that there is no tie breaker.
Does that mean one of the justices isn't doing their job? Do they know about the case? Should we be talking about this as possible grounds for impeachment? That's kinda vague.