I believe they can either appeal to the full 11th Circuit en banc or to the U.S. Supremes. The order stated a requirement for en banc before going to the Supremes, and set a very early filing deadline, already passed I believe.
There is a much better chance of getting the feeding tube re-inserted with an en banc hearing in the 11th Cir. than by having the Schindlers' attorneys argue before Kennedy whether SCOTUS should take the case.
Wilson provided some hope by citing the All Writs Act.