Hmm, are you sure that you can’t do the ripple effect? It would be very good looking if you can do it, we have time for the next release, don’t we?
Really, as CardView is a Material Design component it NEEDS a Material Design ripple effect. Because it’s a Material Design component, and because of this: we need to stick to the Material Design rules and guidelines. It won’t be cool to add another effect to CardView.