I remember a couple of decades ago, there was a very similar concern with safety improvements in light aircraft - some new gizmos came out, and lawyers figured out there was money to be made since the light aircraft manufacturers didn't recall all the older aircraft they'd ever made for a free retrofit.
Another issue was that light aircraft manufacturers would STOP innovating, since finding a better way to do things meant they KNEW their older models weren't all they could be.
IIRC, Cessna in particular was mentioned, and there was some talk that they'd be put out of business by lawsuits. They're still around and selling aircraft (including jets) so I guess ultimately things worked out. But even their cheapest new propeller planes aren't really cheap any more.