Have you noticed how many thread wanderings are started by some of the more senior (ahem) forumites?
Pressing GoTo for the OP here's another thing to consider. The FAA's NexGen plan for ATM is predicated on using technology that will dispense with whirly round radar heads.
If I understand things correctly, ADS Broadcast and Contract will be a major navigation platform for which a "GPS" box is required. Squittering out will show your position to ATS and eventually being able to take in other squitters will let you see other participating traffic around you. Although this is aimed primarily at commercial operators (who don't like the equipage costs) the benefit will be there for anyone to take advantage of.
One important driver is the enhanced situational awareness the technology brings - something I would have thought AAIB would know and support.
SGC