A part of me doesn't want Trump impeached. Pence is everything I don't want in a President on a different spectrum.
Pence is wrong within the normal parameters.
Plus, as an added benefit, for those who want to move on from this administration, Pence would be much more predictable in office and have a much harder time appealing to disaffected moderates. The disaffected largely went to Trump because they felt no one else cared about them and he represented an opportunity to blow up the system that had forgotten them. He openly called for their vote to go shake things up.
Pence doesn't have that quality. If he goes full blown social conservative and starts churning out religious freedom laws, the same thing will happen that happened in Indiana. People would feel discriminated against, it will hurt the economy, his popularity will sink, and you can tie those as an electoral anchor around his neck.
You can also undo the damage of a Pence a lot easier than an economic collapse or huge foreign policy blunders Trump could create.