I agree and as you stated at the beginning, I didn’t mean those teams specifically.I get that you didn't literally mean these matchups above but a matchup of that caliber, but I still think a Denver/Boulder bowl would need a regional team to help the draw. For example some lower-tier bowls which will draw fairly well due to having regional teams:
New Orleans Bowl - Louisiana vs. Marshall
Birmingham Bowl - Auburn vs. Houston
Gasparilla Bowl - UCF vs. Florida (I heard this was already a sellout but not sure if that's true)
Liberty Bowl - TT vs. Miss. State (clanga clanga clanga!)
Duke's Mayo Bowl (Charlotte) - UNC vs. South Carolina
Music City Bowl (Nashville) - Tennessee vs. Purdue
A Denver area bowl would likely need a regional team (and regional is relative in the western part of the country) like Wyoming, AF, BYU, Utah, CU/CSU of course, or KSU to help out with attendance. I don't think a matchup albeit decent ones like Minnesota-WV or a NC State-UCLA type matchup would cut it.
The Pac 12, Mountain West, Big 12 and most of the B1G would draw well in Denver, IMO, and then of course the marquee programs of ACC and SEC.