Long time lurker of the game but IMHO AvalonX
has abandoned it - last release had a sub-title of 'dealwithit' back in 2012 (as though he was fed up dealing with the constant 'when's the next version')
As for the various ones on here - I suspect it's because since the conversion from flash to renpy the actual game is supplied in it's 'raw' state (ie not compiled or compressed) so it makes this game a suitable starting point for anyone who may be interested in making their own renpy game - & that's what I suspect all the other 'developers' have been.
(Don't know about anyone else but I find reading a load of documents explaining what commands to use etc can be boring and complicated, but BSC is a
practical example of HOW those commands work and by looking at it while playing the game you can see what happens in-game & then look through the code on how it was done)
The others developers most probably have also been amateurs, wanting to know how to make a game, see BSC and they think '
hmm most of a game is there - all I need to do is see how they did stuff & basically copy/paste it to add content' but then they realise there's more to that for just one person to achieve and eventually give up.
(TBH I think Pleevy is one of these - a fan who somehow got roped in and is learning stuff as he goes alone - I know I am

)
I suspect it's ONE of the reasons a new thread has not been made for Remake/Reimagined, those 'crazy fans' that are continuing the project are attempting to finish the game while learning at the same time, but even they don't know if they will continue with it so opening 'yet another thread' seems pointless
Although IMHO I think we MAY have a better chance this time round, in this case it's not just 1 person attempting it but a 'crew' of fans, - probably all amateurs in some way, 1 or 2 who have never touched Renpy or AI graphics in their life, 1 or 2 that have a 'little experience' - all 'learning as they go' - but by spreading the load/stress/support between them there's the (slim) possibility of a final completion