Government acceptance is the best kind of advertisement there is. It totally legitimizes BTC -- apparently it will legitimize BCH as well, which I'm sure some bitcoiners won't like.
I also think that as more states do this, the less likely a federal clampdown on cryptocurrency becomes.
It's a fact that people are more likely to use 0.1 BTC to pay their taxes with, than like $800 of their own money, which is all psychology. People are too focused on fiat and thus this is actually be a very smart move.
I'm partial to the idea that Bitcoin's deflationary nature discourages that kind of spending, but I could see this being an attempt to goad cryptocurrency investors into paying their taxes.
Anyway, I hope people avoid paying BTC to governments. These transactions will be "ground zero" for analyzing your blockchain activity.