10W:
Well actually he won't ... because he won't see you
Ah yes, I'd forgotten that part of the TMZ proposal is blanking out the primary. But the scenario is the same. If a non-transponding aircraft enters the TMZ and therefore disappears, the controller will assume that it's at 3499ft or below and won't take any action even though he can't see it - or indeed, BECAUSE he can't see it.
All seems like an awful lot of hassle for a very small benefit, or none at all, and that's before you consider the disbenefits.
NS