>It'll take time for the tech to become viable of course, but as costs for getting material into space continue to become cheaper and cheaper over time, I see no reason that this couldn't become real one day.

Plenty of reasons, basic physics for one. Nor will launch costs continue to drop to a level to make this viable, at least not with chemical rocket technology alone (and no, "spin launch" isn't what I am referring to).

>It's very cool and has such a sci-fi vibe to it.

Which the only reason this crops up again every few decades. This is not about "the tech becoming viable". Unless you want to sent a literal death ray into orbit the math simply doesn't add up (on the other, the math does add up for the involved companies as far as money is concerned).