Like it or not glass is the way of the future for primary thru advanced training. Last I read Cessna has already ended production of 'steam gauge' 182s and 206s and I believe 2007 is the last year for 'steam' 172s to be ordered.
I've taught several students in both glass and steam. While glass panels do display a plethora of information there is no reason why a Private student cannot learn on it. In fact, it's been easier for most of my students with the G1000 panel. It's not like you need a computer science degree. The panel is very intuitive and pilot friendly. If anything, transitioning from glass to steam is MUCH easier than vice-versa because steam displays less information.
Worried about not being able to teach pilotage or dead reckoning with the pretty moving map? Easy- do alot of your training with the DISPLAY BACKUP engaged (which turns both screens into a PFD with no moving map) or simply dim the MFD to 0%.
Every time GA panels get higher-tech the aviation community has this argument that it's 'too much' or 'overkill' for training. I'm sure people were saying the same things when LORAN, VORs, ADF's, RMI's HSI's, etc.. were being introduced into GA cockpits. Folks, this isn't the dark ages anymore. Train on the latest technology, because chances are you won't be flying that piper cub with no electrical system and a jar of oil for a attitude indicator in the future.
Grove