I think it was a very stupid, unforced blunder to call for witnesses and then reverse themselves because the Senate is an aging, corrupt entity. It's obvious this is happening because McConnell threatened to completely slow up COVID relief if they went ahead, and killing the filibuster is the only way to stop him - which, right now, Manchin and Sinema won't do. That's a failure on their part, but IMO Schumer should still take that case to the public and make Manchin and Sinema walk the plank on refusing to do what is necessary to stop McConnell; to both expedite this trial and pass COVID relief at the same.
The Senate Dems are going to eat shít for awhile because of this and those in the Senate who are responsible for this (and I suspect it's only a handful) deserve to. It's good we will be going forward with our agenda and that will heal a lot of wounds, but this is not acceptable and can't be allowed to continue happening.