Crazy to me that anyone is having a conversation about whether Biden should step aside and not which of the Roberts Gang of Six should be under federal investigation tomorrow.
I think his reaction has been appropriate so far tbh, and appropriately concerned. Off the top of my head, he gave (I think?) his first unscheduled primetime speech the same day, and I believe his only one attacking the court so far, and one of his campaign directors said they were "scared as shit.'
But compare to the discourse around whether Biden would hammer Trump over his felony conviction; everyone, including the discourse here, was in despair after a weekend where he didn't say anything, but he's been pretty consistent about calling him a felon etc. since.