Premium only (Paid) Now gets Dropped to Free Access What about theme and Plugins?

Sorry if this was Posted I Could not Find the Answer.
When a person Pays or was manually upgraded to a Premium ProSite member and uses a plug in thats Premium only (Paid) and then his site changed to Free Access Does the Plugins and theme that they were using on the Premium only (Paid) access get disabled or they still can use it.

And If the later is the case Can and/or How can we make it automatic to get switched to the default theme and plugins disabled for the now free user.

I can't be the first to think about this could I?