Tether's market cap is the largest of all the stable coins and it's unclear that Tether's liabilities are sufficiently collateralised and they can't/won't prove that they are. That's a problem for a product where the unique selling point is "stability".
I've been in the Bitcoin/crypto space since 2009 and been through it all. My opinion now is that Bitcoin is an accidental Ponzi scheme - it started out with good intentions but got hijacked by tw*ts. Most of the discourse in the crypto community now looks like a carbon copy of any spread betting / gambling / day trading community. However, instead of a centralised market, there is a Rube Goldberg machine that provides the market infrastructure.
I'm not looking for a different stablecoin. I think the more accurate way to phrase my concern is this "If I own some Bitcoin, what happens to it if the rumors regarding Tether are true?"