All this talk of card only magicians. I could name more famous magicians that aren't just card magicians than magicians that are just card magicians.
And David Blaine? A card magician? Lol. Is this the same David Blaine? He makes use of a huge variety of props other than cards, and is as famous for that than anything else, but what really makes David Blaine who he is, is how he presents his effects whatever they are and whatever they're using.
Try this experiment. Imagine you had a disability, or an injury that prevented you doing card magic for a while. If you love magic, what would you do then? What could you do then?
I don't have a problem with card magicians, but I have a huge problem with card magicians who think presentation is such gems as:
"And look, if I give it a shake....it changes." whilst the whole audience is thinking, who the heck cares.
It stems in my opinion of magicians being out to impress magicians with their 1337 skillz with a deck, rather than thinking about how to impress a spectator, how to add something to their experience of magic.
Fact is we live in horrible times, lol. People walk around believing they know all there is to know most of the time and magic wonderfully questions their right to knowledge about anything if done well. If not you're just a guy with a deck of cards. I'm not saying card magic is lame, but I'm saying that there is a lot of lame card magic around these days. Great technical sleights, but crap magic.
A bit of diversification, as much as you love cards will only help your presentation of card effects, as there is a lot of cross over.