To this day, I still miss getting Dungeon and Dragon in my mailbox
And that's entirely fair. I, for one, miss the cartoons.

You mean like putting such wonderful insights as "If you use profession skills in your game, your game probably isn't as fun as it should be." in print, saying things like you can skake you fist at the cluds (4E) bu they are still coming, portraying players of 3.0/3.5 as too incompetent to even use an index or have a basic grasp of the rules in their 2007 Gen COn youtube video, or having a dragon "poop" on detractors of 4E in a Penny Arcade cartoon?
Yeah, I still think you are reading way too much into many of those comments or cartoons, sorry. I'm sure I can't convince you otherwise, but I'm pretty sure no one at WotC set out to actively insult players of 3rd Edition - but when explaining possible issues with the edition, and reasons why they were making changes, someone was bound to be offended by it.
When I can consistantly participate in Pathfinder games that have three to four encounters in the same time frame it would take to resolve one 4E encounter, I have to conclude that the designers of 4E really messed up somewhere.
Yeah, I really don't believe this is true. If pathfinder combats are genuinely 15 minutes long on average, I'll be really impressed. (Given that in my own experience, 3.5 and 4E run about the same average combat length. 3.5 had more potential to either end really quickly, or take an entire session, while 4E has a longer timeframe per combat without as much deviation from it.) Your experience may be different, sure.
But claiming that 4E was designed "around an excruciatingly slow combat system that makes playing the game almost unfeasible" is such incredible hyperbole that it completely undermines any point you were trying to make.
The "rules updates" (both the amount and nature of them) have caused many people I know to completly stop buying WOtC's books and let their DDI subscriptions lapse. It definitely is costing them business. They should do some QA and try to get decent rules the first time around.
On the other hand, the rules updates are helping them keep me as a customer. They are, in fact, one of the things I am most impressed with them doing as a company. I'd certainly prefer they get the rules right the first time around - but given that has never happened, I'm also a fan of them fixing what they get wrong rather than leaving broken rules in place.
In any case, I'm very doubtful that they have lost serious custom from books or DDI over the presence of updates.
And again - even if so, your claims about the situation are so outrageous that I still would have to object. Some people don't like the errata - I can accept that. Claims that books instantly become obsolete and that the data is impossible to keep up with? Again, whatever genuine point you might have, the more you distort the situation, the less likely people are to accept or understand what you are trying to say.