I don't know if anyone has covered this, but turn to the character sheet at the back of 3e PHB and you'll find a full page RPGA add. Also, there is absolutely nothing wrong with advertising your other products. I don't see how some small little box that merely mentions the RPGA and clearly states its purpose gives any indicator that it's the only way to play.
As for the rest of the OP, it's non-sense. The concessions given are the only reasons to play a game, while the rest should have absolutely no bearing on a person's choice to play a game. For someone who is "HONESTLY trying to be positive about 4e", the OP seems to be being incredibly dishonest by not actually being positive and not just admitting having no interest in investing in a new game.
Sure a 22 page errata is a bit much, but it has been standard operating procedure for WOTC for some time now. If you don't want to deal with it, then stop buying their products. Instead of having an editor dedicated to rules consistency, WOTC just coughs out what they have and posts the errata as it comes. It saves them production money, but I think it costs them in the long run. I suspect that they were in a bigger rush to get it out the door than even they realized, or at least bigger than they realized they would be at the time they promised there wouldn't be a 4.5, but then maybe the promise just means that no matter how much errata there is, they won't do a 4.5 under any circumstances, making the consumer bite the bullet. I hope they provide some kind of special edition that includes the errata'd rules.
A legitimate gripe should counteract some point in the paragraph the OP stated as the concessions. Errata is just not a deal breaker to enough people to affect the game that much (Of course, a company can't know how much a bad practice affects them until they change the habit, and I think if WOTC ever wakes up and starts editing its material properly they'll find their sales improve significantly).