I don't think it's odd. I think the speculation that some reader features are being rolled into plus is accurate and google wants their internal people dog fooding those implementations.
If they were rolling it into G+, they would have announced that first. It simply doesn't make sense to lose your users and then try to regain them, instead of providing a migration strategy.
That might make sense if they are a one to one equivalent. I think it is unlikely to be the case however. Losing a few million users of a niche product doesn't matter to Google if it wasn't a large revenue stream. Rolling out features that fit the Google+ scheme as they are ready makes more sense to me.