Academic here- Scholar is used quite a bit, but they are competing with some big players, some that offer a lot of full-text Google doesn't. It can be useful to get your research started, but I don't know anyone who has used Scholar from start to finish for a piece of scholarship. So you're probably right on the money.

I'll be inconvenienced if I lose Keep- it's very handy and I use it extensively on a daily basis. But there are plenty of competitors in that market space- some excellent ones are open source.