Blacky_Stardust was an Amiga and AROS user at one point, so the decision to drop it wouldn't be based on a lack of knowledge of the systems.
It's a shame, but VICE still has SDL support as far as I know, so even if the Amiga OS native API support is dropped, breaks, and is unmaintained that's always an easier option to keep up to date.
Im all for updated software, but I dont think it'd be the worst bit of software to stop getting updates for should it come to that. It's very mature and feature rich already. Even as a long time c64 fan/user there's been nothing Ive been wanting in VICE that hasnt been there for a long time and compatibility and accuracy is fantastic.
Again, it'd be a shame, but unless new killer features that I cant think of at the moment are added even older versions probably more than suffice for the vast, vast majority.