If your concern is with upgrade, you can still upgrade the VCenter and it works fine.
If the concern is with netapp plugin working with vcenter, depending on the compatibility of netapp VSC with latest VCSA 6.7 update 2/3, if you update it before upgrade it should be fine..
If you do not wish to use netapp, you can unregister the plugin from mob and upgrade VC ...
Thanks,
MS