The only reason Matheson didn't lose this year was because the Republican nominee was a pathetic loser, and Matheson still only ended up winning by 4.5%. A decent candidate would've taken him out.
Splits up Matheson's share of Salt Lake County between a Happy Valley-based district and a district that stretches up to the north. Either way Matheson would be screwed, since he's not known to voters in the north part of the state, and the Happy Valley will not vote for a Democrat ever.
Agreed; that was basically the premise of my map. Although yours also has the quirk that Park City liberals will be represented by Jason Chaffetz. 
What was pathetic about Philpot, might I ask?
Park City is already represented by Rob Bishop, so it wouldn't be a huge change.
Anyway, Davis + Morgan + Weber + Box Elder + Cache + Rich is only a couple thousand people over exactly one district (when there are four districts), fixed when you drop North Salt Lake. Therefore, it will be difficult to justify tying part of the north around the west side of the lake where there are no roads again. Northern Utah is pretty parochial and will want its own district. That may defeat attempts at gerrymandering away Jim Matheson.
