Yeah, a mall by me has a GMRS repeater setup on RPT16, the same channel the local repeater, fortunately using a different tone, I use is on only 6 to 7 miles away with around 80 registered users. Their license expired in 10/2015! They still use it.
They way I look at it their choices are as follows.
1. Keep using it. Ignorance is bliss.
2. If the repeater gets "hijacked" by licensed GMRS users, ignore them. (see option 6 why this might be the better choice for the moment)
3. Get a legit business only licensed frequency. Then have their radios reprogrammed, repeater reprogrammed and the duplexer re-tuned to use it.
4. Shut it all down and go away.
5. Switch to using FRS radios instead giving up the repeater.
6. Complain to the FCC about their repeater getting "hijacked" by licensed GMRS users, get shut down by the FCC and pay $10k's in fines for operating illegally without a license for almost 7 years. Then go to option 3, 4 or 5 anyway.