I can't speak for anyone else, but I don't plan to stop working on the game any time soon, no matter if all fans lose hope/interest/whatever. On the other hand, I'm not personally going to go back and work on bugfixes for 1.29.x; it would feel like throwing my time away on a version which will be replaced pretty soon.
I'm not averse to just going ahead and releasing a still buggy and incomplete 1.30 alpha release quite soon, though.