I posted saying that a few weeks ago. And I think it is a real risk.
But now that a few other people may agree with me, I will throw out some reasons not to totally panic.
One – Trump may peak too soon, and then be beaten too badly to cheat his way out of it post-election. I’m planning to vote the day I get my ballot, almost surely in September. But most people won’t do that, so it is still early. Polling trends will likely NOT be a straight line.
Two - Related to the above, riots are more a summer thing than an autumn activity.
Three - While the U.S. Constitution gives state legislatures the right to pick electors (and fails to give state governors a right to veto their choices), the U.S. Constitution ( Article I, Section 10, Clause 1) forbids state ex post facto laws. A law changing how electors are selected, passed after an election held pursuant to state law, seems to me an ex post facto law. The GOP would claim that the ex post facto clause only applies to criminal law, but, well, the Constitution doesn’t mention that.
There also is a possibility that Roberts would rule that if a state constitution gave the governor the right to veto, and the legislature has voted, however long ago, in favor of said constitution, a veto by a democratic governor, like ours in Pennsylvania, should be upheld.
As for Biden’s possibly less than superb speaking ability, I know of no evidence, that being a good speaker, helps you win the presidency.
So – no cause for despair, just concern.