I would tend to agree, perhaps a decade ago it was easier to define the uniqueness of Riak, and now there are alternatives that offer similar guarantees. So the relevance of Riak is not as obvious.
Also as we focus on stability on OpenRiak going forward, that means reducing some of the capability that may have made Riak stand-out in the scale-out space. The preference going forward is to do fewer things, but do those things predictably well.
There will be differences between Riak and FoundationDB, and I hope those differences are sufficient to make Riak interesting, and allow it to continue to occupy a small niche in the world of databases.