3 things in my life coincided recently:

The first: Frogboy's Play More Land thread.

The second: I've been talking a lot to a friend of mine that plays Vintage U-based control.

The third: I've re-kindled my interesting in compressed-curve control.

The deck is a Lim-Dul's Vault pseudo-toolbox deck, playing Counterbalance and whatnot with a few 'bullets' or 'tutor' targets. I was left with a few slots open and was thinking about what to use there when my Vintage friend brought up Crucible of Worlds in regards to his current Ubw control deck, and it sounded like a good idea. The context Crucible was brought up in was a God-Hand (that, by chance, isn't legal here ), but it got me thinking:

Since I'm not playing a ton of lands, and the control mirror is most likely going to be decided by who 'lands' the most lands, why not play Crucible as a pseudo bullet in the control match? Making sustained land drops from turn 3 onward until you don't have any more fetch-targets in the deck sounds pretty nice. Some Landstill builds are actually cutting it from the deck as a one-of, so naturally, this begs the question: why don't more control decks play Crucible, and why is it normally a one-of?

tl;dr Why isn't Crucible of Worlds more popular in control decks playing fetchlands? Is the concept of using Crucible to assure land-drops not viable?