I did not know anything about them all quitting. This is the first I have heard of it. One can only think there is dissension in the ranks. Given the rather wobbly beliefs and goals of Tom DeLonge, it is not hard to think that some have become disillusioned by the whole thing and are jumping ship like drowning rats.
More disclosure promises unfulfilled? Smart people not wanting the crazy to rub off on them? Who knows. Other than the release of the tic-tac videos, TTSA has not really done anything worthwhile to advance our knowledge of UFOs. The videos were a big thing they did. It may end up being the only worthwhile thing they have done. Too bad.