Market and real life intetgration is key. DASH usability soundings could be pivotal. Coming round to idea that 'Bitcoin' will evolve as holder of value, and not a payment system, as will not want to spend much if keeps going up.

Could the solution be a fee only blochain ledgers that process all Cryptos, so the blockchains are cost neutral? Global or National/Regional payment setlement ledgers, could iradicate scaleability problems by giving a different blockchain option to transfer wallet to wallet. Perhaps future forks / rivals to BTC & BCH will be more useable with proof of life of holder, and recycling of lost or dead holder coins? Sustainability issue of lost coins seems to need to be resolved for a Crypto to be sustainable long term.