Shouldn't tryouts stay around at least for 1 more round at the slightest, before being completely dumped? I know LAV video has been added in last release already, I think that making it default is fine (especially since it seems that swscale will be stuck with that slightly wrong 10-bit conversion forever). However, to have it as only decoder at the same time isn't exactly conservative to put it diplomatically.
I use grab, OSD (for special purposes naturally), and software scaling. There are probably numerous people who use deband. While I consider postprocessing like deblock/dering to be generally bad, in general the filtering functionality is quite useful - it should at least be enable-able imho (for example through settling ffdshow to process raw video - it would be actually ideal if the setting application was able to do that /idea).
(Edit: oh and the avisynth module is rather useful when you want filtering that isn't really available in video players - derainbowing, ivtc, chromashift come to mind.)
That being said, I can certainly install everything myself instead of relying on CCCP. But I believe it is a valid reason to keep ffdshow
P.S. Last week, I actually ran into some issue in LAV video that would make it crash (EDIT - wait, I think it was actually that LAV Video would introduce a crash in ffdshow somehow) when outputting rgb32 on one PC... I forgot what it was exactly, sadly. But I'll leave it here as an anecdotal evidence that ffdshow might not be deserving to be completely thrown under the bus just yet.
Last but not least, thanks for maintaining/developing this thing.