IMHO, my problem with the new FP+ system is two-fold:
First, it creates a certain inequity between those who stay on property and those who do not. Before, all park tickets were created equal in that everyone had the same access to attractions or to FP equally. Now, those who stay on-site will have a distinct advantage. I feel like everyone who has a park ticket should have equal access to all parts/attractions of the park, and with the on-site FP+ advantage this is no longer the case.
Secondly, it kind of means the entire Disney experience is going to change. It's pretty much an admission that the crowds are really big, lines are really long and I think this is an attempt to make some people (especially first-time or rare visitors) think they are really getting something special by having an assured FP for certain attractions (even if they are for attractions or times when a FP is not even needed).
The reality is that WDW has plenty of people filling its parks and this is about the only way they can kind of start to keep people happy (especially the first-time/rare ones who don't know any better).
It also puts WDW in a position to ensure more people stay on-site because they know how difficult it might be, or how early they have to be at the parks if they don't.
As an annual passholder, I actually will like FP+ when it's implemented for me because it will make going into the park for 4-5 hour visits very easily and will guarantee me the 3 attractions I really want to do in that time without waiting in line. So in my case, I do see it as a positive.
However, I sincerely feel bad for those who don't realize how busy the parks are and for those who do not realize you have to make reservations for almost everything--these people are going to go to the parks thinking they are going to be able to eat at Be Our Guest, ride Toy Story or just be able to walk into a table-service restaurant without FP or ADRs, and these people are going to be SORELY disappointed and I feel for them.
To me, this new FP system basically means that WDW knows its parks are too crowded and the lines too long and I feel this was put in place to hopefully appease with the thinking that as long as guests get 3 guaranteed short waits (even for those attractions where it isn't needed) they will feel it was worth it, while at the same time creating more reason for people to stay on-site.
For me, it's not as black and white as some people make the issue, and there are pros and cons depending on which type of park guest is involved. I do think my largest complaint is the inequity it creates in that an off-site guests ticket is no longer as good as an on-site resort guest's ticket and I think that is wrong.
In the end, as much as people may disagree with or not like the new FP+ system, it's not going anywhere as long as there are people coming to WDW. I think WDW's gamble is that there are always going to be new people coming to the parks who are not in-the-know about these disadvantages the new FP creates than there are people unhappy who will stop going because of it.