Long term isolating every single person potentially in contact with the virus isn't sustainable. If one person gets it in say a bank do we have to shut that bank down plus the workplaces of anyone who came into contact with that person? I know they did in March when Arteta and Cal got it but that (just like lockdown) was a sticky plaster solution to slow the growing spread.
The whole world is eventually going to have to coexist with the virus. Ignoring the trivial stuff for one minute football pumps billions into the economy and keeps thousands of people (per club) in work (and ultimately, many children fed), that reason alone will ensure that it's back once logistically possible.
While football is a simple sport played by 22 man on the field, EPL football on TV is a big deal that needs hundreds if not thousands of people working simultaneously to provide us with live football we see on telly.
Let's just imagine:
1. Bus driver to drive the team, you can't expect them to take tube?
2. Referee, linesman x 2, backup ref
3. FA officials (could be minimised, but you'll need someone in charge for legal reasons)
4. TV (I don't know how many people they'll need for camera + broadcast + manager etc), let's say around 20. Not to mention their own logistic people
5. Coaches / Ass. Manager + 7 subs + club doctors
6. Stadium personnel (lighting, groundsman, security, gatekeeper, etc)
7. Police + medics on standby
8. TV back office in hundreds of nations trying to make this broadcast possible (and their own manpower necessary to make things happens)
before you know it one match will need 100+ people. And we're talking about 20+ over matches a week in EPL alone.
That's only directly, not to mention indirectly having competitive football matches means players have to train daily, and opening their training complex means a whole bunch of people would start risking infections just so you can watch football.
The game of football is simple, getting there is a hassle not worth the risk in times likethis.