I don't think it is as big a discovery as CRISPR. These are very cool, but in a basic science sort of way. The unknown proteins may be massively useful for methane processing, but no one knows that at this point. There are similar, although much smaller, genetic elements such as plasmids and BACs which could fill a similar role anyway.

I don't see what could make this a really big deal outside microbiology yet. But maybe someone else will see what I am missing.