The REALLY low rates are for a very short time period. So unless they stretch that to year round I don't see it impacting other hotels that much except for those specific time frames. Also, I would be incredibly surprised if Uni extends those prices to other timeframes — there's really no need to, even in the case of driving out other hotels.
Lastly, talked to a local hotel broker and they said if Uni's strategy was to drive out other competition, they would face a lawsuit based on predatory pricing. Of course, the other hotels need to prove it. But if all of a sudden a local major corp opens a product at a CRAZY low price where they have little history of doing it elsewhere, while just so happens to have a major addition (the 500 acres) under development with plans for more hotels that could seem a bit fishy for a court. Many of those hotels may be gone before such a suit is ever heard, but it wouldn't be good PR for said company.