(Moderation comment: partially moved to the new thread.)

Well, unlike faster-than-light travel, it doesn't blatantly violate known laws of physics
The problem is, the impossibility of faster-than-light travel is not explained by any known law of physics. It's postulated "as is" and the whole physics theory is built upon that postulate. It's overall accepted, it's proved by innumerable experiment and observations but it never has been plausibly explained.
On the other hand, today's real-world physics predicts that IF Einstein-Rosen bridges actually exist at all, anything much larger than an electron would be crushed into "singularity" while attempting to pass through the wormhole. So, science-fiction which depicts ships going back and forth through wormholes is essentially "stealing" a valid concept from modern physics and using it in Magical and unrealistic way -- they might as well forget any pretense of science and solve the problem of interstellar travel by using the Floo Spell from Harry Potter!
I agree, but please remember, that however modern and strange and complicated the relativity may seem in fact it is a classical physics theory in the sense that it isn't a quantum theory. So nowadays it is perceived as outdated and needs to be redesigned in order to be built in the modern quantum perception of the world. As for the quantum theory, it opens doors to almost boundless flight of fantasy and speculations.