Yes. As far as I know all the ASICs out there will only do SHA256 (though some might be even more restricted to only work with BTC). Some hash algorithms would be prohibitively difficult to put into an ASIC. There might be some other algorithms that could go into an ASIC, but that are used on coins that just aren't worth the development effort to do so.

Whatever the reason may be, it puts everyone on much more "even footting" when it comes to mining.