I've been occasionally using futureme.org since ~15 years ago, in case you're a believer in the Lindy effect. FWIW I don't think I've ever used it for anything more than ~1 year ahead, that always seemed fun/interesting enough. Of course there's other considerations entering the picture if you plan ten years ahead, but then again this seems like the kind of fun/light-hearted thing where it doesn't really bother me that I might not end up reading it again --- life happens...