Can you explain the logic and rationale behind trusting a completely anonymous developer (or set of developers), and not trusting Microsoft?
Let's speculate for a minute (just for the hell of it, because it's fun...and speculation carries as much weight as all the other rumors). Since the TrueCrypt devs are anonymous, who's to say that it wasn't a NSA/FBI/3-letter-agency project to begin with? They build TrueCrypt with the goal of being able to decrypt anything that evil-doers (child pornographers, terrorists, organized crime, etc) are using TC to protect. Then they pull the plug on the project because there are alternatives being developed and maintained by private industry, and they've got hooks into those anyway.
Again, that's all speculation and it's just one of the wild ideas that can be imagined. But I see no reason to trust anonymous developers over any other software company. TrueCrypt could have been developed by the US, Chinese, Russian, etc Gov't's, or it could have been developed by someone with the intent to be able to hide things from those organizations. But you don't know, and really no one knows other than the developer. Even the folks involved in the on-going code audit have very little communication with the dev(s). It's extremely secretive, and secrecy doesn't breed trust in my book.