Don't be so sure about that, it looks like a real proposal to me (if nobody yells it's going thru). So far it seems to be very little concerns about the changes to STR.
If the guys in STR are OK with the changes that fine, I will stay in BStock, but if you don't want to be running against who knows what then you need to be sending in your letters. Don't think nobody will spend $40k+ to run a local only class. I know 1 of the locals STR drivers owns (or did) a Cayman, slowchildmiata just got an Elise (I think), and somebody else I know has been wanting an Elise or NSX for a long time.
Don't sit on your hands then yell when someone shows up with an Elise built to the limits of the rules.
I would be surprised if this went thru without an exclusion list, but the proposal does not have one, and very little noise on the various autocross forums about the change in STR. Again if nobody yells they must be happy with the changes.