Coinbase better figure out some way to allow their customers to put up the fiat in some sort of a bond or some such. Seems unlikely that this trend will stop at Wyoming.
(Even though it makes negative logical sense given the stated goal of the regulations...) I would put up, say, $25k to do $25k worth of activity since the need would be transient and the $25k would be the 'bandwidth' rather than some sort of a total. Nobody (should have) ever expected the interface between cyrpto and mainstream to be easy, cheap, or counter-party-risk free since mainstream financial systems themselves fail on all three counts.
Obviously I'd want some way to be reasonably sure I get my money back. The mainstream financial system lacks the kinds of mathematical guarantees that are possible with crypto where I could have much better confidence that a bond would be returned since it could not be appropriated indefinitely. Not that Coinbase seems very interested in developing these crypto technologies, but they are possible and will be selling points to future off-chain providers.
I am not sure it matters if the trend continues. Where will the people in Wyoming go now? Why to competitors that are not based in the usa. The difference between Coinbase and traditional banks is that the banks have fractional reserves. AFAIK none of the online exchanges/wallets do this. So you might have a lot more security with coinbase versus a traditional bank.