Why? I might as well set a reminder to become Batman. It’s clearly not based in reality. You offer zero proof or reasoning behind your claims.
If you truly believe they are going to replace the incumbent candidate for president 3 months before the election, I don’t know what to tell you, you need a better understanding of US politics and how this stuff works.
But I don’t think you believe that. You’re constantly looking for ways to depress support for Biden and this is just another tactic. You don’t engage in good faith so there’s no reason to give you the benefit of doubt.