I don't understand why international restrictions would need lifting for the 100, 46 or 19 to proceed; sportives are only amateur morning rides with a bit of tinsel on.
The Classic and Classique are a different matter (being UCI events), and I believe the Brompton race has some special status too.
However, I agree it's unlikely that any of RideLondon will proceed. Large gatherings risk a further spike in infection rates, so I think we're waiting for the inection to peter out, for herd immunity to emerge, or for a vaccine to arrive. Who knows how long that is?