I worry that the adult CNS will now be considered to be inferior to the still current FNP.
That could be concerning. I agree.
I can't blame you for considering the FNP at all.
As long as you do not allow your certification to lapse or move to another State, your CNS certs should be o.k.
I know, the word, "should", is concerning.
I'm with elkpark......I have no plans for another degree/certification should mine be retired.