Will this spread beyond colleges?

I expect this number will continue to grow and by next fall every college, other than state schools in states with certain Republican governors, will require COVID vaccinations to come back to campus.

My only question is whether the vax requirement will spread to any other businesses or institutions outside of academia. I'm not talking about a formal or state supportedl "vaccine passport" system (thanks to GOPers playing politics that isn't going to happen in the U.S.), I'm just wondering whether some conferences, theaters, cruise ships, restaurants, etc. will start asking for proof of vaccination for people to attend, and if that happens how widespread it will become.