The only thing that I would be worried about is, what if they decide to change the stats on cards that were once "worthless" and make them way more useful... Or maybe game-play changes in a way that now gives advantage to cards such as Rusty Android... As of now, I can't remember a time where I actually used rusty android, but I think I am going to keep leveling up all of my cards.
With that being said I love the Idea and the support for the community you are giving by using your Maverick upvote.