We don't need them as indiscriminately and wastefully as we currently have them.

We dont need a lot things. Lack of "need" has never stopped humans. Switching to renewable energy certainly won't change that.

When solar is providing us electricity at 2 cents / KWH, we will use them even more indiscriminately.

Well, for lighting the battery costs are more relevant.

But nowadays you don't even need to wire electricity to the place you want to floodlight, so yes, we will only use them more.