My point here is, if governments green light bitcoin ETFs this means they are not trying to ban it or kill it off, thus legitimising it as a real currency/commodity. It's the same with regulation and tax--if they are not trying to outlaw it and add rules around its use instead (like they do with every other financial instrument), then it further legitimises bitcoin.
RE: Chicago Exchange (CBOE) Recommends Allowing Bitcoin ETF To SEC