Eh, a lot of the hype is fake hype and how long will it really last?
The convention could easily work against her as well. She's going to have to give a speech and she can't talk for more than 5 seconds without coming off as a complete loon. Plus they can't keep her off camera, eventually she's going to have to give press conferences and do debates. The longer they put that off the closer to the election they get and the more fresh in people's minds any fuck ups will be.
Plus you still have the issue of ballot eligibility. Ohio may be off the table completely for her and as soon as she's officially the nominee you're going to see lawsuits in a number of states. State eligibility laws may keep off the ballot in a a number of states where even one could be a huge loss for her. There's no precedent here, a nominee has never stepped down this late in the election process which may mean some of these cases end up in the SCOTUS.
Tinfoil argument: That may be part of this. There's a lot of things here that give them fuel for federalizing election and more ammo against the SCOTUS in general. They may have waited this long to replace Biden with her intentionally to force SCOTUS cases to make the SCOTUS appear more political and have another fallout like what happened after Roe v. Wade was overturned.