It is my opinion that by sitting on the House Articles of Impeachment, Pelosi is denying Trump the right to a speedy trial - justice delayed is justice denied. So, when the Senate reconvenes on Friday 3 Jan, McConnell will ask his caucus if they want to accept the same rules that governed the Clinton trial, with one proviso - the Senate can set a deadline for the house to send over the Articles, after which the Senate will vote to start the trial anyway, or maybe just hold a vote right off the bat to dismiss the charges. It's no secret what the charges are, the House wrote these big-ass documents detailing every little thing, and it's not like they need to be waiting on the house to finally do it's duty. Plus, as I noted above, due process is not being carried out here for political reasons. I think the Senate is justified in forcing the issue.
So - what's Pelosi going to do if the Senate tells her to send over the Articles within say 72 hours after they reconvene on Tuesday 7 Jan (I think it is), or else they conduct the trial anyway, and probably have a vote to dismiss. Probably scream bloody murder and go to the courts for a stay, which will be appealed if granted. But I don't see this nonsense going on for long, everybody knows damn well the GOP-controlled Senate is not going to vote to remove Trump from office based on the ridiculous charges brought by the house. And the Dems have already said they will impeach Trump a 2nd time if new evidence surfaces, so WTF? They should've done a more thorough job in the 1st place, and I don't see the courts buying their argument that they can wait until the Senate agrees to their demands for how the trial will proceed. Frankly, it's none of their damn business.