If I'm being selfish I would like him to do something completely new and different. I want to hear a new emotion, a new combination - the sound of something being born in him rather than layers shedding and dying away (much as I love his 'shedding' work and Blemish is probably one of my favourite albums)... Nine Horses is also great and I like the way I don't have to be in a particular mood to listen to it, but I also quite like it as a one-off in fear of it becoming repetetive.
But, really, wherever he goes I will follow, even if he continues to break it down - just to know that he is still creating and inspired to create is brilliant. I know they are not really comparable but I feel quite sad that Bowie seems to have suddenly vanished into thin air... I dread artist's block, but I dread even more the time when I will never escape from it...
What I think Sylvian will do next is probably a stream of instrumental work, maybe record birdsong or something?