I think that's not a failure, but I think it's a bitcoin double functionality that can act as a currency to make payments, and can also be used as an investment vehicle because the price has experienced significant increases over time.
in other words, bitcoin is a currency that can be made into a means of payment, and can also be used as a means of storage of wealth.
I agree on this, It did not failed currency. It is far different, bitcoin just needs support and the media is against it so they will influence all to turn their backs since the price drop is happening they're taking advantage from it. Bitcoin is so underrated and ignored by the government, they didn't knew that this can lead into progress and the future of our currency not just the hassle type of currency which is the paper money. Bitcoin will definitely make it to the long term part, the rate is just declining but I know bitcoin will pull this off.