Hm, I wouldn't see the Raspberry Pi 3 as the "culmination of all their work", but as a tiny part of it. The specific hardware IMHO is the most boring part of what they do. There are tons of cheap-ish ARM dev boards now, there always were in many ways "technically" better boards, for most purposes it doesn't matter that much what the specific Raspberry Pi X looks like (I was really surprised they came out with the 3 so fast, it didn't seem necessary to me). What's interesting in my eyes is the publicity, community, and ecosystem they've managed to attract.