I'm quite certain that nobody but Disney know "exactly what Disney is doing with this technology". You have extrapolated what they "could" do to be "exactly" what they "will" do.
The reality is they are highly unlikely to database every movement of every guest. For starters, it would require immense amounts of storage just to keep that information on tens to hundreds of thousands of guests per day. It is much more likely that they will monitor your purchases and send deals to you that fit your buying pattern while you're there. The other aspect that's likely is feeding your name into a ride so as your ride vehicle goes past certain show elements, it "personalizes" your experience. That's likely the limit of "individual" tracking. On a broader scale, they will likely be monitoring in global terms the ebb and flow of guests through the parks and target some extra FP+ at guests in crowded areas to entice them towards less crowded areas.
Tracking every individual's every move, while technically possible, would be quite expensive with little or no return on investment.
They can monitor your purchases now without this $2.5 billion dollar investment, without these RFID readers, without these bands... All they need to do is, and I stated this before, to add the purchase to your database when you use the KTTW card as a charge card... With the RFID technology, they will now know when Monty enters Emporium, not just when Monty buys a shirt from Emporium... That is the difference today... And again, no paranoia there... Nothing nefarious going on with that...
And I disagree about tracking each individual's movements would yield little to no return on investment... Again, they now know Monty has entered Emporium, and has spent 10 minutes looking at the tee shirts... apparently, Monty is conflicted, do I buy this shirt now or no?.. Well, Monty gets a text/email: MONTY BUY THIS SHIRT WITHIN THE NEXT 5 MINUTES AND ENJOY 15% OFF!!! Monty buys the shirt... Now, spread that out over 50,000 people a day, for 365 days a year... Yea, they are going to get a nice return on their investment even if half fall for the marketing ploy...
I will agree with you regarding the ebb and flow of guests... And this is where I see this as a positive... They will be able to, with greater ease, determine the most heavily crowded areas... And they can help disperse those crowds... Send a text/email to half the people of a free FP for rides spread over the park to use in the next hour... People think they got a deal and run...
I, for one, do not subscribe to Disney's evil plot that some do with this technology... I'm going to use it in October... I'm waiting for the confirmation email that my bands have been shipped (still have 10 days to customize them so it will be at least another 2 weeks before I get them)... I made my FP+ choices already... I want to test this out for myself before saying if I hate it or like it... I do hate they spent the money on this and not attractions, but it is what it is, and no amount of complaining about it will change things... I can say I don't like the choices of only 3 attractions, but hey, who knows? Maybe they tweek that too...