From a UK perspective...
At the moment, we stay on-site, so Disney will be able to track when one of our keys open our doors, when we enter the parks, when our keys are used to get Fastpasses, and when we use our Free Dining credits. With RFID, it seems that Disney wants to track us more than this, and with FP+, they could be looking to try to increase hotel occupancy, if they start to give you more FP+ for staying at Deluxe Hotels, etc.
But, for us, if they take away free dining (QSDP) and Extra Magic Hours - we have already said that we will start looking at off-site hotels (we're already planning a night at Universal next visit anyway) - for us, prebooking Fastpasses is not worth the extra cost that Disney charges, and if others are like us, this could actually backfire and hotel occupancy could continue to drop, and Disney will lose the ability to track when we enter our rooms, and when we use our Dining Credits, and if we buy a RFID protecting wallet, then they will actually be able to gather less information on us than they currently are!
I know that people on here do not like free dining, and I am not talking about sit-down restaurants/ADRs, I am just talking about quick service. For us (and probably lots of people from the UK), Free Dining has been useful to counterract the change in exchange rates (£:$). We converted the same amount of £s into $s for spending money in 2007 and 2011. In 2011, for every £1.00 that we took we got $0.30 less than we did in 2007 (in 2007, the rate was £1:$1.90+, in 2011, the rate was £1:$1.58, and in 2013, it has been as low as £1:$1.53 - for comparison, September 12 2001, the exchange rate was £1:$1.46, January 2002 it was as low as £1:$1.41), so everything was automatically more expensive. In 2007, we had to pay for food. In 2011, we had free QSDP. In both years, we spent the same amount of £s. So, for us, free dining "paid" for the drop in exchange rates. I wonder for how many other families it is the same.
It seems as though UK attendance to WDW will be dropping throughout the next year or so (fuel taxes have increased, so flights are more expensive [some flights have nearly doubled in price this year]), one Tour Operator seems to be pulling out of Orlando, and others are cancelling/combining flights. So, if our exchange rate continues to drop, and we lose free dining - I would bet on seeing a lot less UKers in the parks, and I would also imagine a drop in UK hotel occupancy.
I'll say this, on a UK WDW site that I am also on - NextGen/MyMagic+ seems to be going over as well on there as it is here!