Considering its Sunday number, it should have no problem hauling in 15M today. The Dark Knight had >10% drops each of the next three days in its cycle, and it still managed a 3.27 ratio of (Mon-Thu)/(Mon). If you give the same ratio to Transformers with the conservative 15M figure for Monday, it'll already be at 250M before the fourth of July weekend.
It won't have legs in the traditional sense, but for HSX purposes, I doubt it'll drop like a stone compared to its adjust price. It's already more than halfway there.