It’s time to start speculating about a post-Trump 2019. Supposing Trump is impeached, Pence moves up, and Congress starts to talk about replacing him as the investigation reaches Pence.
Then the Dems, now in the majority, citing the Garland nomination, refuse to approve a new VP. “The people should decide.” (imagined quote).
When Pence is convicted, we get, glory of glory of glories, President Pelosi. Pelosi, of course, re-nominates Garland, no longer subject to the filibuster.