I believe this is a needs 60 votes to proceed DOA resolution. Beltway theater and no more, unfortunately.
No, changing the Senate rules only requires a majority. The Constitution gives the Senate full discretion on how they can treat an impeachment. The only reason they are waiting is because of a Senate rule, not the Constitution. The Constitution gives little guidance and a lot of latitude to the Senate.
Beltway Theater is a fulltime thing -- when it comes down to the wire, the Repugnican RINOs know they'll be out of a job. Those who plan to change parties after their next turncoat act should [self-redacted comment].