Well, If PKI wanted to modify Top Gun, Im sure they will find the engineers and the company willing to do it (Arrow or not). Of course it would cost PKI quite a bit of money, and I dont see PKI investing a whole lot into Top Gun unless its a major change (as in, enough to really attract people to the attraction and thus the park).
Personally, I like Top Gun, it may not be a major thrill but its a nice breezy ride on a warm day when all the other lines are long. Now if only the walk back was shorter.....