I won't go with "nothing". My answer is, "whatever is profitable enough to invest in ASIC design and development". So, if X11, or BobsMagicHashingFormula becomes the next big thing, then somebody will develop an ASIC for it. If there's money to be made, somebody's going to make it 
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.Perfect answer. You will notice coins say asic resistant. They do not uses (or should not) proof. If there is a big enough market share there will be a product for it.
A n/x11 would be nice but I don't know if or timeline we will see that. Scrypt and of course SHA-256 are controlling the game right now.
In fact, an X11 ASIC was a project I wanted to take on. I'm well aware of the capital required to produce ASIC's but if the cost can be justified and an FPGA implementation followed by a few sample batches produced ( well under 500,000 USD I hope, but if costs get out of whack this is gonna be one hell of a project
) I think the garnered interest could be used to develop one. Of course, I'm talking in very loose terms. Making my own ASIC company has been a long time dream of mine. I've heard plenty of "you're not going to make it" or "somebody get rid of this noob" but I honestly don't care. Just gotta pull through. I'm just gathering some useful data for that venture
