"The End of Time"'s narrative perspective -- with Timothy Dalton in the future, narrating events that are already past -- certainly offers the possibility that in Dalton's present the Doctor is already Matt Smith, and we may be seeing a story that brings closure to the tenth Doctor, without actually having a regeneration, leaving Tennant's era open-ended (which would facilitate a potential Tennant movie), while also ushering in Smith for new adventures.
At this point, I'm rating a regeneration at only 30% odds. For that matter, I'm putting odds on Smith being non-contiguous with Tennant (in other words, there are Doctors in between Tennant and Smith, with Smith possibly being an earlier Doctor[/i]) at 10%.
Hmmm, interesting speculation in here! The idea of no regeneration leaving it open really appeals. What better way to boost a DW movie than to make it a regeneration movie! And, there were hints and rumors of DW movie.
I do think Smith will be Doc #11. They're going to want to keep that line intact for the viewers. The succession of Dr's is one of the few constants in the show!
So, no silly reboot of a successful show, probably in tact Dr lineage, but possibly no regeneration. Although, I can't reconcile that with the tattered suit. That may make that scenario impossible.