If the Buccaneers front office is indeed listening to offers for Revis, then they were just handed some extra firepower. Many more teams can now afford his large salary, and if acquired, would use the same cap-hit delay tactics available to the Bucs. The biggest obstacle for teams to target Revis in a trade has been somewhat cleared, and accordingly, his trade value has (theoretically) gone up. Smith might be less willing to part with Revis, now that there is cap room to re-sign key players and fill out the roster in addition to retaining Revis, but this cannot be confused with having a weakened ability to trade him.
Simple supply and demand will show that free agents will be at a premium this offseason with the bloated salary cap this year and the promise of further increases in subsequent years. Many big names have already been locked down through the franchise tag, and teams will be scrambling to find elite talent to get them that push over the top.
It is not clear at this time if Revis is actually being shopped, and the de facto deadline to trade Revis is rapidly approaching (the 3rd / 4th rounder to NYJ). Whether or not a trade materializes, it is very likely that more teams will make inquiries leading to possible offers, and the Bucs are sitting in a good position. At least when it comes to Revis, an increased salary cap can only be a good thing.