Sadly, that outcome is all too possible... But let's not starting calling bus accidents. There was an episode of Lost where that led to an actual "accident" of that very nature. Yes, the manga is still ongoing and Miura is (these days at least) moving at a very slow pace. He seems to take very long breaks anymore, but that's partially explained by the insane amount of detail he puts into drawing massive armies and such. The latest compiled volume to be released in Japan is #34, and we're nearly up to that count here in the US. So...once we hit that mark, it's going to be the long waiting game of one volume every year...if we're lucky.
Despite the copious amounts of time I spend with Alteil, my main job is that of an anime/manga translator. I translate Berserk for Digital Manga/Dark Horse (along with Hellsing), and to this day it's my favorite project I've ever worked on. Well, Genshiken (the anime) was a lot of fun too.
I don't blame you if you don't want to buy vol. 1-12, but I at least recommend you borrow, rent, get from a library, or otherwise find a way to read them at some point. There are some exclusive factors therein that add a lot to the story. One of the biggest, I've always felt, was a little flashback Guts has of his childhood in vol. 9, and what it leads him to do. This was removed entirely from the anime, as was the event the flashback concerns, which is understandable as it deals with some very disturbing content. It's still a shame though because that was a huge character-building moment (and not just for Guts).