It will require clarity from the Football leagues.
If the leagues are truly voided, and cancelled - then the bookies have no choice.
If they end the season in their current states and declare people champions etc.. then the bookies will be able to wriggle their way out of it.
I suspect the latter will happen. The large sponsorship deals the bookies have with Football clubs will amount to some pressure to ensure that they make the right call for bookies and leave enough ambiguity to let the bookies off the hook.