I don't blame you in the least.
For my part, I'm not annoyed with the delay.. as a geek I get that tech takes time and effort to iron out the growing pains. What's stuck in my craw is Verizon's arrogant silence on the matter save for canned PR announcements written by their out-of-touch legal department. It's beyond obvious Verizon knows that customers are aware something's up. And yet they can't be bothered to just say what the hold up is even if they don't know how long it will take to fix it.
First the problem was Skype. Then Best Buy screwed up. After that, it was the iPhone's fault thanks to underwhelming sales. And the battery life "revelation" has been particularly titillating. Now the problem this week is allegedly Verizon's SVDO implementation, which is supposed to make voice and data over 3G a reality. Fact is no one outside of the Thunderbolt project has the first clue what's going on. Meanwhile the forums and blogs are burning down in pointless, immature flames.
People would be more reasonable if they know why they were waiting. As of now, there's no official reason for the delay, which makes this whole situation unreasonable. This entire launch has been a load of avoidable drama from start to finish.
That said, the main issue with your plan to leave is simply this: not many are going to leave over a phone that they know will be here soon. Sure, there's venting, but no one is going to be serious about it once they look at this with perspective. People are going to ask themselves: "What other carrier has a phone that remotely compares?" I'm guessing most with come to a conclusion that looks a lot like mine: T-Mo is less than financially stable, their coverage is painfully lacking, and they have no real 4G road map. Sprint? Ditto with the financials. Sure the EVO is nice but it's WIMAX and it's clear that tech isn't in the game for the long haul. Then there's AT&T, no friend to android customers, but they'll take your money just the same. Disabling HSUPA is low and a clear admission of network inferiority. Why bother if they're going to keep crippling their Android phones in order to divert bandwidth on their overloaded network to give the iPhone priority? On top of that, they get to decide what apps can go on your phone. All of that nonsense for the same price as Verizon. Pass.
No matter how many people actually leave, you can take it as a given Verizon will pickup converts from other carriers -- AT&T folks like me for example. So basically you can take my whole lecture here to be the equivalent to this simple statement: People will deal with it Verizon is the best Android game in town right now. The problem is the game really sucks.