Google+ is an Outpost, Not a Home Base
Just to keep pointing this out: do not move to Google+, if you want to own a piece of Internet real estate that you hope will have some kind of value for you over time. Value can equal whatever you want it to equal.
Google+ is an outpost, meaning a place where you can go, communicate, use great tools to make interesting connections and learn new things.
But it's not your home base, a place that you can alter and edit and make into whatever you need it to be, a place where you can add and subtract tools and features as needed.
Throwing away your primary website or blog so that you can have more engagement on Google+ is like moving into a hotel room and thinking that you've got a great thing going.