I ran into an article about making wormholes which pointed out that there is nothing in principle wrong with them. More importantly, the mathematicians' distaste for topology changes which I had unthinkingly assimilated is bullshit. There is no justification whatsoever in physics for wormholes not to exist. Mathematicians might not like them but fuck em.
Then again, maybe I hadn't assimilated mathematicians' distaste of topology changes too much. My main objection to wormholes has always been the unthinking unquestioned claim that a wormholes' insides have no geometry. That travel inside a wormhole is instantaneous because there is no distance between the wormhole mouths. When you start taking geometry seriously and dismissing topology, such a claim becomes bloody fucking stupid.
But just because faster-than-light travel through wormholes doesn't look even remotely likely, it doesn't mean it's impossible. And what's interesting about wormholes is that in order to create a wormhole between two points light years apart, you need to transport the wormhole mouth at sublight speeds. Unless you've got a warp drive of course since a wormhole mouth is just a bunch of warped spacetime and not matter.
That's where things get interesting because it means wormholes can't be used by a civilization to expand faster than light, only to travel faster than light internally inside the civilization's boundaries. And that makes wormholes really, really interesting because they don't violate the Fermi Paradox.
The Fermi Paradox is bad enough when confined to sub-light speeds. It's bad enough that it proves conclusively and without a doubt that aliens do not exist. If a civilization could expand at FTL speeds, that would mean aliens don't exist in the entire universe. Something which is not even remotely credible. Hence the Fermi Paradox proves that FTL cannot be a feasible method of civilization expansion.
But, wormholes don't offer any way for a civilization to expand faster than the speed of light, only to stay unified as a civilization as it expands. And that makes them rather interesting. Because they're feasible. Maybe. Whether they're possible at all is an independent question. As I already said, I don't think they are, but it would be fun to discover otherwise.