Will Planet Fitness controversy lead to another anti-trans bill?

MSNBC reports:

The cancellation of a Michigan woman’s gym membership at Planet Fitness for repeatedly complaining about “a man” in the women’s locker room has sparked concern among LGBT activists that Michigan could be the next state in the country to introduce an anti-trans bathroom bill.

“I think in Michigan our opponents are apt to do anything they can do to attack us,” Yvonne Siferd, victim services director at Equality Michigan, told msnbc. “That kind of policing would involve a lot of unintended consequences, and while it would appeal to the base, I don’t think it would appeal to a majority of people. But I wouldn’t put it past our legislators.”

Whatever happened to "liberty of contract" ?