I don't think,that Bitcoin is used only in those "sensitive" areas.Bigger part of Bitcoins are used on serious platform too:trading,e-commerce and there are so many other activities.Some people may abuse cryptocurrencies,but I think we cannot generalise at all.
Exactly, bitcoin has shown a rapid growth in comparatively less time as that of gold or other commodities, so we have experienced the potential of bitcoin, and even if it use utilized for those activities, I see a great picture shortlyin near future considering the activities of bitpay and zebpay, etc. We have not yet accepted it fully (I mean in most of the countries you cant spend bitcoins directly, so you have to convert it in fiat) and hence there are lots of opportunities and it will be too early to generalise it.