No, it's full of bugs and missing features, just look at the trackers. It is not, and unlikely never will be, a replacement. It doesn't even support concurrency yet.

I will never, Postgres proper is maintained by many people who know what's in the code. I have no interest in millions of lines generated by one person who has no idea what's in there. It would be irresponsible to downstream users to put them and their data at risk.

Have you tried it, or did you think the question was a good quip? I suspect the later because you aren't familiar with the issues it contains.