Won't happen, they would rather have a more polite less insane Trump than an actual liberal
What does that make Obama?
A couple other factors are Democrats paying too little attention to local and state races, and trends of Democrats packing into big cities leaving massive amounts of territory in between even more solidly Republican.
The Democratic packing problem in urban areas is overstated, given more people live in cities than in rural areas and, remember, Trump is winning rural voters at just as high rates as Dems are winning urban voters. In theory, the GOP is wasting as many votes as Dems are.
It's much more pronounced in the electoral college and in the Senate, where state lines are inherently tilted in favor towards rural states but in the House (in an ideal, non-gerrymandered world) it shouldn't be a factor. When it comes to winning the Presidency or the Senate, it is a glaring issue that needs to be addressed (and, given Dems have Senators in all kinds of rural states, I think we'll be fine). But not one that acts as the primary obstacle towards a house majority.