Denver is a huge metro area. Do you think fans would go see a UFL game? I honestly don't know. I do think UFL would be successful in Portland. But it may be a few years before the league comes back out west.
The only reason to do that is if they are certain Pittsburgh will take him at 21. No team after that would take him until the Jets pick again at 33. After that however, there's the risk AZ takes him at 34. After that, the Jets pick again at 44, and I don't see a team between there that will take him (Titans, Saints, Browns, Giants, Raiders, Dolphins). This is the latest I see Simpson being picked, as after that you have several teams that would likely take him. Falcons, Steelers, Rams, Colts. Any of of them could grab him.
Raiders have likely one of the hardest schedules in the NFL this coming season. They play the Broncos, Chargers and Chiefs twice. They play every team in the NFC West (maybe beat AZ? The other three? No way), they also play the Colts, Bills and Saints. The only other teams they might beat are the Browns, Titans, and Jets. I am predicting 5-12, after maybe a 1-6 start But we'll know more when the schedule is official, and after the draft, then camp, preseason, etc.