I am not ready to spend around $3K in a normal lens, and many people out there won't. Canon needs to update those lenses that do not render good IQ and sharpness, rather than focusing on improving 'excellent' lenses.
Well, remember that 24-70 is a bread and butter lens, one of the most important in Canon's lineup. It is to their benefit to ensure they have the best version available out there IMO. Tamron is getting a lot of business with a nice quality 24-70 f/2.8 IS lens for half the price due to Canon's unwillingness to release an IS version.
Also, Canon does not HAVE to increase the price, they could actually *drop* the price of the non-IS version to ~1699 which would put it in a lot more reasonable space than it is now. Then put the IS version where the old version was, at 2299.
I hate when people make this much sense! Sarcasm of course, because I totally think what you're saying is what canon should do! I've used the 24-70 II and loved it and would buy it if it came down in price a bit more especially with the way you say they should do it!