Lessee, I ride a Bike Friday with 20" wheels, a road bike with 650c wheels, and a mountain bike with 26" wheels. I am 5' 1-1/2". I simply can't imagine how I would begin to fit on a bike with 29" wheels without looking and feeling ridiculous, not to mention having major handling issues. Fortunately, I have no need to replace my MTB, so it's a non-issue, just one that makes me say ...huhhhhh? 
I would love to see a photo of a gal my size riding one!
Emily
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow