It's an interesting problem.

The posters above Me are more or less right, but they are basing their answers on how crypto / mining works *so far*.

If you're basing your idea of crypto on ... well ... Cryptography, than No.  No, someone will absolutely use GPU to run your algorithm.

But.

What if you based it not on a repetitive algorithm (Recursion, I know.) but on something else.  For example, solarcoin is based on production of electricity, not processor cycles.

I don't have an actual answer for you, but I have asked this same question Myself.

If you're interested, I do have a few ideas...