Here are my UA predictions, not all at once, in one year, or even all of them ever starting, but the following each seem like likely to at least some extent for UA.
City 1-City 2-Weekly Frequency-Equipment Type
Chicago-New Haven (CT)-14x-CR7
Chicago-New York (JFK)-21x-E75
Chicago-New York (SWF)-14x-CR7
Denver-Mammoth Lakes (CA)-2x-CR7
Denver -Santa Rosa-7x-E75
San Francisco-Colorado Springs-7x-CR7
San Francisco-El Paso-7x-CR7
San Francisco-Ho Chi Minh City-7x-B789
San Francisco-Long Beach-14x-CR7
Washington (IAD)- Asheville-7x-CRJ
Washington (IAD)-Fort Myers-7x-A319
Washington (IAD)- Manchester (NH)-14x-ERJ
Washington (IAD)-West Palm Beach-7x-E70
More details to come later on some of these predictions later
DEN-CHS, ORD-TOL, SFO-CLT, SFO-CMH and SFO-MKE seem the most likely at the moment to me.
ORD-BIS and ATW-DEN (though I had thought GRB-DEN) were on my handwritten list but were just recently announced by UA.
Frequency growth will probably center on DEN, where I see FWA, LGB, AVL, and CHS as new routes. LAS, PHX, SEA, PDX, and SLC could use more frequencies on departures from DEN's major westbound banks.
I would loudly endorse DEN-AVL and/or a return of IAH-AVL.
I am quite surprised United doesn't serve IAD-AVL. Further, the only service to the DC area from AVL is on G4, right? Has United ever offered IAD-AVL? Seems it would be an easy add especially given the growth recently at AVL and united has been adding service at IAD.
An IAD-AVL afternoon flight seems likely given some Southeastern U.S. destinations are served from IAD and not EWR. Given AVL's proximity to IAD, that would seem a possible route for a UA CR2/ERJ. IAH could be resumed to (was served until ~2013), as UA seems to have gotten over its "squeeze and hurt IAH" phase, at least in rhetoric. It may depend on oil prices, though, high enough for local demand, not too high as to make 50 seat regional jets uneconomical.