Some opthalmic practices that specialize in LASIK already charge below $500. I will not say which, but that info can be found out easily through a couple of phone calls from your yellow pages.
Secondly, optometrists don't do LASIK surgeries except in Oklahoma. Even so, the scope is limited for optometrists anyway. I don't see how the low price of LASIK is relevant to the outlook of optometry profession, since 99% of optometrists don't and are not allowed to do LASIK.