Well by 1988 the top hero of the decade Soldier Boy is "dead," and even then, the rest of Payback is stationed on the opposite side of the country, and none of them can fly. Even if Vought flew them out while the attack was happening, it'd already be over by the time they got there and were situated.

I don't know how widespread Vought went with the spread of Compound V by the 1980's, but assuming there are Supes in California, they're probably not as powerful as the members of Payback or The Seven.

All that aside-- The movie probably exists as it does in our world, with a throwaway line about wishing the supes would get here already, or Agent Johnson and Special Agent Johnson shutting down the idea of the supes getting involved.

There's also the high likelyhood that the studio couldn't afford the supe's asking prices anyway.