They have ample evidence without Pence's testimony. Meadows was way more involved than Pence, and he's going to sing like a bird to avoid a 20+ year sentence. If he does not make a deal, he's still going to be in prison LONG after Trump is dead, for nothing.
The one thing that would insure this never happens again is not to put conspirators in prison. It's holding a 14th amendment hearing and disqualifying all the insurectionists and their supporters from ever holding office again. That would keep us a democratic republic for the next 100 years.
