I agree with you but got a better idea, how about we divide ALL the states up into 3 groups and hold those primaries on three consecutive weeks?
Sounds like a better idea than what is currently the situation. Of course there are always unintended consequences with any plan...I can see that the one with your suggestion is the most successful candidates are likely to be the ones that already have name recognition and big bucks to spend on ads off the top. Additionally, there will be less opportunity for the unsuccessful candidates to influence the better known ones by challenging their ideas over the full length of a normal election cycle. (of course with the republican primaries ending early it appears the only influence applied was generally from Huckabee expressing his faith...all the candidates were spouting their religious views when it was raised in reaction to Huckabee for a time). The value of that influence to the race might be debated as well.
The primary system probably should be revamped but we have to be careful. If you put too many states together it would have the effect of eliminating low budget candidates. This time it would have been only McCain, Romney and Giuliani competing.
Reagan was nominated with the same system we have now. It knocks out the conservatives that are not acceptable to the country at large. That, at the expense of pure conservative or regional candidates.