Not promises, but predictions. I don't think Nakamoto anticipated the massive interest in speculation, which is driving the lack of stability.
Long term, I'm more bullish on solutions like GNU Taler[1][2] that don't try to invent a currency, but instead work with existing currencies to simply transactions. I don't think Taler will necessarily be _the_ solution, but something like it could work out.
I mean, I get that a lot of people see it that way, but it's always struck me as giving off an experimental vibe. Presumably an enduring solution to something as fundamental as a monetary system should have stronger design principles. By contrast, Bitcoin feels more like a prototype/demonstration of blockchain technology mixed with a social experiment.
Long term, I'm more bullish on solutions like GNU Taler[1][2] that don't try to invent a currency, but instead work with existing currencies to simply transactions. I don't think Taler will necessarily be _the_ solution, but something like it could work out.
- [1] https://en.m.wikipedia.org/wiki/Micropayment#GNU_Taler - [2] http://savannah.gnu.org/projects/taler/