Wow...
Ok, I'm going to try to clarify some things here, though I know with many persistent angry forum-goers, they can never be persuaded. First of all I'm typing this on my iPhone, so I apologize for the lack of links.
Also, I am an avid Starcraft follower and I am a forum moderator at a Starcraft 2 Forum, so most of my information is accurate.
First of all, Starcraft is, as you know, being released into three parts. Second, Bnet is NOT charging. At least, currently, they don't have plans to charge. This may change in the future, but it makes no sense to flame Blizzard over a rumor and a possibility.
Also, currently it would seem as if the first installment will be the main one, with the second and third to be Expansion packs. The Terran -> Zerg -> Protoss. The multiplayer will be included in the first with all three races and WILL BE UPDATED every expansion pack - for free - it would seem. The expansion pack will include a spanking new campaign with all the new features integrated in. As a side note, while the campaigns will be primarily focused on one race, there will be other races thrown in.
Finally, for the price issue, the first pack seems to be the one costing the most, with the other three acting more like an expansion, but costing more than a real expansion pack. This is due to the new single-player gameplay being added to each race. The new Terran single-player system that we have seen will NOT be the samw for the Zerg and the Protoss. I don't know what, but it seems that they will not incorporate buying units like the Terran Campaign and choosing your missions. They definitely might offer the same capabilities, but Blizzard will present it from a different fasion. For example, SC1 had three liner campaigns that were the same with the debriefing room skin changed and different voices/words. SC2 won't have a Zerg themed Terran briefing room. It will be completely different. One last nte is that each campaign has complete endings that will satisfy you.
As such, I believe, as many attenders of Blizzcon believe, that this radical change is extremely wise and Blizzard has made a fantastic decision.