Here is the message directly from my TA:
“My advice this year is that it isn't worth it... Last year, we had several people get warnings that they had too many days of Fastpasses on their account and their LAST DAY of fastpasses would be cancelled. This year, with Flight of Passage, Slinky Dog Dash, Frozen Ever After, and Seven Dwarfs Mine Train still being hard fastpasses to get, it isn't worth the risk to get a bonus fastpass or to, and risk losing some of these new and popular rides. If they are removed, we will NOT get them back...
The system MAY allow you to book the extra fastpasses, but I'd advise against it. I know you'll see that people are doing it, but I wanted to make my opinion open to you and I'm happy to discuss further if you wish!”