It's between speed vs. decentralization. Which coin will be adopted by most? Many say it's in the top 20 already we have still decided what we're going to use as THE PROTOCOL coin. Educated opinions welcomed.
Five years is long for crypto...better, faster, meaner coins will likely come out between now and then.
For now...
BTC is the king...unless major hack happens, it will likely remain king as wealth holder, like gold...not your daily spending cash.
XMR seems to be secure as the king of anon coins.
ETH, NEO, QTUM will likely grow as the major platforms.
ICX, ARK (if they can deliver) will probably be huge in integrating various platforms.
Then there will be the top for each application/category; payment, medical, credit, identification, etc., etc.