I upvoted the stellabelle post as well as this one. I like that other platforms are being discussed. I don't agree with several points stellabelle made because as pointed out here, the platform doesnt exist. But the post generated a lot of discussion about what users want, whats attractive about the synereo idea and how steemit can be improved. The tone was a bit off putting and the band-wagoning in the comments. But still I think the post was valuable. Do i believe synereo has all the answers, no. But some of the ideas around social contracts and social computing are fantastic. As pointed out in stellabelles post they also have mechanisms for stopping abuse etc. All great ideas, but im not sure many if not all couldn't be implemented using the steem blockchain or through steemit.
Ultimately its all speculation though as fyrstikken pointed out, it doesnt exist yet.