It seems highly likely that at some point before the end of the UK season supporters won't be allowed to attend games, the only real question seems to be when.
But, as we've seen elsewhere, the possibility of the season being suspended altogether can't be ruled out.
Presumably if one player was to be affected by the virus then at least some of their teammates might need to go into self-isolation too at which point their ability to complete fixtures is clearly affected.
Goodness knows how the authorities would deal with the situation then. On one hand, it would seem incredibly unfiar to pretend that the past 7 months haven't happened and restart from scratch next season. That would mean Spurs would still be in the CL next season but Leicester wouldn't be for instance, and Norwihc would remain in the PL.
On the other hand, if you were to take an approach like the Rugby World Cup where any games not played are declared a 0-0 draw then that would seem massively unfair on the team who is narrowly relegated or misses out on the CL/promotion, etc.
Given the relatively small number of games left to play, if any leagues were suspended, perhaps they could attempt to continue the season form its current position whenever that is possible, even if it means adjusting the schedules slightly over the summer or at the start of next season.
It's obviously much more serious than a football story but could certainly have some striking implications and some difficult decisions to be made.