I'm not saying you can't make a Rock weakness work. You can. It was just such a constant drone on the Syclant threads. Admitted, Syclant was carrying a 4x weak to Rock, so it was a magnified problem. But, right now, it seems like Stealth Rock is SO overplayed in the metagame. There will be all sorts of SR discussions with this pokemon, no matter what we do. Indirect damage, the ability to spin away indirect damage, the ability to block spin, the ability to counter the spin blockers, BLAH, BLAH, BLAH. I'm so fucking sick of it!
Yes, it's a way of life in today's metagame. But, do we really need to invite even more focus on it, by creating a pokemon weak to Rock? Yes, the other spikes come into play -- but they're nowhere near as prevalent as SR.
I love the idea of Fire/Water (although I think of "steam"). Actually I love the idea of lots of Fire combinations. A true Fire/Ghost "Will-o-wisp" (where do you think the move got it's name?). Fire/Dragon -- How can this NOT be done by now? C'mon Fire Dragons are the most common dragon type in all sorts of gaming lore. I could go on.
I just don't want to deal with any more Stealth Rock talk than is absolutely necessary.