And, with that said, I could see DVC being the next logical step in trying it out, if it moves past club level. I personally think, and this is just my own speculation, that it will be a hit with club level guests - what's another $50 on top of the $600+ they are paying for a night? At that point the time/money equation tips way too much in favor of getting the service. After that, though, Disney will find that it will actually shorten the average trip of most people. They will be able to get more done in less time, lessening the need to stay and spend money for multiple days.
DVC makes sense as the next place to try as a trial for two reasons. The rooms are already paid for so they do not lose any income if we stay a shorter amount of time, and many DVC members are also AP holders due to the good deals on discounts on them, so they will not lose ticket income either. With that, DVC members most likely spend less on dining and souvenirs than the typical guest as well. It makes sense for them to see if DVC members who take advantage of the service ending staying for less time, and if they find that to not be the case, then opening it up to all deluxe resorts, deluxe and moderate, etc.
I personally doubt that this trial will continue in its current format, though. It is too much for too little financial trade off. If it was only one or two of the 90 day booking window, extra FPs, multiple park FPs, or preferred fireworks seating, I could see the trade off working, but not all of them.