I don't think it's lack of pace that brought Rauf, Tonge, Rampaul and McKay undone - they just didn't bowl very well. Obviously the slower you bowl the more disciplined you have to be, but I reckon it's more a case of them just bowling rubbish than not having the tools. I distinctly remember Rampaul bowling a particularly threatening spell in which he reversed it for example, and let's not forget countless other examples like Watson's form with the ball this summer, Stuart Clark's record up until last season, McGrath's record before that, a few of Asif's spells in this game, Bravo's bowling throughout this summer, Kallis's bowling last summer etc etc.
Pace and bounce are obviously a bit more valuable in Australia than elsewhere, but I don't think there's a speed cap at 140 to be successful by any means. Like anywhere else, it's about bowling well and using the conditions - it's still quite possible to do that at 130 and 135. I think people are sucked in by the fact that really fast bowling looks more effective in Australia, but it really isn't. For all the hype about how well Roach bowled this season, how well Sharma bowled when India toured etc, they actually weren't very effective. I agree that both were unlucky but I do think it is a bit of an illusion at times. There's a big difference between batsmen playing awkward-looking shots and batsmen getting out.