People were being suspicious of tether for some time, but let's say tether is legit and they have all the reserve they're saying we can still see a huge "bank run" that could crash its price simply because of those suspicions spreading. Maybe those who are spreading the news are hoping for a crash to buy more? Not very probable, but we can't dismiss any possibilities. The options that I see are:
1. They will get a decent audit done and deal with it the right way.
2. They will have to deal with the bank run and a possible crash despite the rumors being true or not.