You can consider the technology already failed horribly as it has been surpassed by several altcoins on every aspect that is important for mainstream adoption.
I don't see things that way. There are other coins I prefer, such as Dash, but there are so many other cutting edge crypto technologies emerging I don't pretend to be able to keep up with them. Bitcoin is still the largest network by far, and looks like it's heading towards a more establishment future with ownership ledgers based on the blockchain and other technology start-ups aiming to dismantle visa and mastercard's duopoly. This is not the anonymous digital cash which people originally thought it was, so if you want to get off the grid, pick your alt, that rabbit's out of the hat and won't be going back in. That was never that large a market anyway, so speculating on bitcoin from the perspective is over, yes.
The mainstream financial system, however, is not long for this world in my opinion, and bitcoin is entirely ahead of anything else to replace it. This also addresses some of the centralised mining issues and 51% attacks which bitcoin isn't optimised for, because that's not a problem for the financial services sector, you already have a tradition of many large data centres distributed globally across different corporations and nations.