A lot will be around who 'controls' the coins, how easily available and user friendly it is for everyone to use. Massive education will be needed to get this into motion with most having phones to transact to and from.
IMHO bitcoin is the gold of the system that will hold, cryptocurrencies are needed for smaller denomination spending.
With this I totally agree - There are a number of systemic issues with BTC. Amongst them speed. If you are buying large capital items BTC is fine. But for FMCG there are better options on the table already. Soon with the @sportspodium currency POD we hope to build on this. But we must all pull together