It's a lot easier when you're not competing with 40,000 people that all have advanced access to the FP+ system.
The more I think about it, the more I think that in addition to doing away with advanced bookings, they need to retain the paper slips as well. Guests need to have them as a reminder because not every guest will use their phone. If they use the in park kiosks they get a piece of paper, if they use their smart phone, they can use the bands. Both ways should be available and once again, it should all only be available day of.