This is the best I've felt about the direction of the team in years too. This is a low bar.
I think this season is going to be interesting, but it's not going to be good. That's not how rebuilds work. You don't turn it around in one year by trading 2-3 players - that is how the old Flyers thought.
I suspect Briere will take a wait and see approach to this season. If the team is severely undermanned (I don't see any way they aren't), I think they will try to move TK and/or Hart at the deadline. This would be smart, bolster the farm system, and put the franchise on a timeline that makes sense.
If this team is a contender in 5 years, it will mostly be because Gauthier and Michkov (and anyone else they draft this year or next) are stars. I still think the core of this team when it is good is mostly not yet on the current team. It won't be TK and Hart leading the way then (certainly not from a statistical standpoint).