I wasn't aware that it was a requirement for a good season to have all-star playwrights.
Personally, I think it looks like an interesting season. Plus, it's nice that Playwrights seems to be working harder for more diverse writers, which can't really be said for a sadly large number of non-profit theatres.
I am a firm believer in serendipity- all the random pieces coming together in one wonderful moment, when suddenly you see what their purpose was all along.