But while Mont des Alouettes, Mur-de-Bretagne, Super Besse and Saint-Flour could have been raced more aggressively, they were still short enough that gaps created would be small enough that every contender would still have something to protect. You need to have something that sorts out the status quo and separates the contenders from the pretenders, otherwise you're left with 16 teams trying to get contenders, no matter how fanciful, up towards the front in case of splits, and the other 6 trying to set up their sprint train, and because everybody still has something to lose you're left with a nervous péloton, which causes more crashes and paradoxically causes the elimination of contenders. If you sort out the GC status quo, even if it's just with a fairly simplistic mountain such as Arcalis in '09 or Siusi in the '09 Giro, you remove a bunch of those guys who weren't realistic hopes for the GC, so you lose their guys trying to protect their GC position and adding to the melée in the péloton, whilst not removing major contenders (if you can't stay with the bunch on, say, Montevergine di Mercogliano, you were never a serious threat in the first place), plus adding to the list of potential stage hunters who can make the race more exciting. It doesn't have to be a mountain; a reasonable early ITT can do it - the Cholet one in the '08 Tour made Super-Besse a lot more interesting than it was last year, and that was only a mid-length TT, not a full-length one like, say, the '08 Vuelta early one.
I'm not saying we need to put Mont Ventoux on stage 4, I'm just saying that both for the spectacle and for safety, something needs to give people something to gain rather than just having everybody with something to protect.