That only applies to e-ticket rides most likely. Because I think V.P. Nick Franklin was pretty clear there would be other "surprise and delight" FP offers sent to you throughout the day. It is conceivable that if patrons punt the e-ticket rides, they could have remarkably cool vacation.
Think about it. You plan a FP+ for 7:00 pm for Splash Mountain. The rest of the day you pick up a FP+ for Peter Pan and Jungle Cruise. Then you get a bonus one conveniently in a lull in your schedule for Buzz Ranger Spin when you are over there enjoying the Carrousel of Progress and the People Mover. At another time, you are waiting in line for Haunted Mansion, you are sent a FP offer for Little Mermaid.
If you give up Space Mountain in the scenario, skip Big Thunder, and settle for Splash. You have already had a pretty good day (and 5 FP). Then fill in the gaps with a Train Ride, A Riverboat Ride, and don't forget to catch that Laugh Floor Inc show. Have coffee at Starbucks, eat lunch at Be Our Guest, and sneak upstairs for dinner at the Columbia Harbor House.
If you still have the energy and the time, stop in to see Abe, climb through the Treehouse. AND finally right before close go ride Pirates of the Caribbean a few times.
Schedule another day, and you can use that FP for Big Thunder Mountain this time, watch a parade, explore Tom Sawyer's Island and cruise the Its A Small World and experience their new interactive boat ride. Book a time to hear Belle's Enchanted Tales and sit back and wait for those Bonus Fastpass offers to come back.
There is still plenty to do......just give up the e-ticket rides...