Mr. Laser Beam wrote:
^ At the very least, aren't there multiple future time periods (in both onscreen canon and current Treklit) that clearly have the Federation's survival assured? The 29th century of Braxton, the 31st century of Daniels, the Jake & Nog framing story from TGTMD, etc.
Not necessarily. The Federation could fall and be rebuild. What do we know about history from the 26th to the 28th century? Compare the fall and reconstruction of the USA in Postman, Shattered Union