This is an attempt to overthrow the government through a pseudo-legal means. This warrants an Executive Order, a declared emergency, forcing in-person voting *with ID*. Otherwise you can bet on a violent outcome in November.
If you are talking an EO from the POTUS, as you don’t really say, then per the Constitution of the US the POTUS does not have the authority to bring forth such an EO. Only the States have this authority. Should Trump try this an EO every Judge, no matter who appointed them, in the land would overturn it as soon as the case crossed their desk.
Remember the demoncrats are looking for loopholes in which to circumvent the POTUS, not just Trump but all future “R” Presidents. This has never been about Trump and it will always be about the demonrats seizing power for themselves in order to destroy the Constitution of the USA and subsequently the US.
I’m sure you are right. With mass mail voting, I believe November is going to be ugly. And it sounds like there is no avoiding it.