The SNS isn’t going anywhere, and there’s no reason it should do. It’s a very good concept that simply hasn’t been used very well for the most part, so far (everyone just went for the out-of-the-box cookie cutter approach, by and large). Now that the community can actually contribute to its development and maintenance it should unblock a bunch of much needed improvements. I for one, will be building up an extensive testing suite to ensure any future upgrades don’t introduce any breaking changes for the numerous prospective SNSs I’m working on.
Toko sounds like an interesting alternative, not a replacement. Very interested to see it in action, as the proof is in the pudding. I’m optimistic though - sounds great.