The SCOTUS isn't going to get involved unless they are provided with clear, foolproof evidence. Not he said, they said stuff or complaining about recent rules that were changed, clear, foolproof evidence.
If it remains he said, they said stuff and complaining about recent rules, there's a next to 0% chance that they do anything major. They are not going to throw out tons of votes because half of America is upset about the 2020 election results.
I already expect the consent decree in Georgia to go away in the medium term because it's caused a total uproar, but it's going to be too late to affect 2020.
1 out of 3 states actually doing a "hearing" about the election ain't too bad I guess (Michigan and Arizona said they have no knowledge of one).
Edit: And the PA "hearing" sounds like something that's informal, so maybe it's like that presser from last week where Rudy melted on TV.