We can't say this thing right now because the future are still bright with bitcoin. Yeah, for now a lot of black propaganda just to ruins bitcoin reputation but I still believe in the future of this thing, bitcoin will become a major currency in the future. This is just the beginning.
Indeed, now a very visible that bitcoin is used for investment. It can not be denied if bitcoin is more visible as an investment asset than is seen as a means of payment. This is because bitcoins are limited due to state policies that prohibit bitcoin as a means of payment so bitcoin can not function as a means of payment maximally. Bitcoin only performs its function as a means of payment in a country that gives legal status to bitcoin. In a country still banning bitcoin, bitcoin is used secretly. So in my opinion, bitcoin has not been declared a failure as a means of payment when bitcoin is still used as a means of payment