The potential effect of what this find has with anything we do is something that will come with time if it ever does. It's way too early to tell. Not having read any of the paper myself yet, I can only speculate. But I can just imagine the potential of an organism that can thrive off metabolizing arsenic in terms of environmental cleanups and other forms of decontamination.
"Don't confuse facts with reality."
-Robert D. Ballard