Kinda wish was a modernized winamp skin system that just use html/css much like electron based apps.. would be great and cross platform, would be a huge boost to a newer skinning system for winamp.. the current xml based one is just so messy and the lack of being able to inspect elements and just do css styling is so much more easier.
There's nothing to stop someone making just that but the issue is more in whether you are then going to have people actually using it. Cross-platform isn't all that helpful unless the base player is able to support it or it's taken on by other players as a more standard skinning solution (which imho is probably not going to happen with the current state of play).
The other approach would be to transpile modern skins into something newer but you're then still in a position of effectively writing 2 skin engines - the new one & one that does the transpiling between what we have now & what is needed for the new solution. Maybe that is a better solution for the long term (as it's a viable thing for Milkdrop / AVS presets) but it's still got to have interest from people to start coding it & the additional is does having an effective browser as the ui make sense (my initial thoughts are marred by the demise of songbird which was doing just that).
Will leave victhor to help with the other part of the post as he knows better about what needs to be considered.
-dro