Frank,
Perhaps you should be looking at this from another angle. A bit of lateral thinking perhaps.
Now, we are looking a bit down the track here, but this is the way I look at it ...the greater the percentage of GA/RA aircraft that are equipped with ADS-B Out, the greater the chances that CASA will be less inclined to create more restrictive airspace.
Say there was 100% take up of ADS-B ... and say that low level ADS-B surveillance became a reality ... what real basis has CASA for creating anything more restrictive than Class E airspace ( in most locations) as virtually all aircraft are known to ATC.
The only reason for implementing a higher classification would be so that ATC can obtain VFR positions from procedural information ... which they would no longer need... in the main.
The reverse is also true ... the less low level surveillance we have ... the greater the need for Class D and Class C.
BRM/KTA/AV are proof of that.
So, you can be free in E (and I'm talking about the real E) or continue to be lumbered with position reports and clearances in D & C.