No coin is going to have Mass Adoption.
1. That is centralization
2.  That is bad, m'kay
3.  Mass Adoption would entail raising $100Trillion evaluation, crazy numbers, and would never find stability for years.

But 100s of coins can establish communities and be worth $10s of Millions.  And can trade against each other (compete).
And 40-100 coins will be generally known but most who delve into the crypto space.  And these top tier coins will hold $100 Million caps.

BTC is still Lord of the Crypto realm.  ETH has come knocking but is set for 1-2 year bear market due to super hype cycle.  Look at the BTC chart ... ETH is at late 2013 on the pattern.

Besides...
Mass Adoption will come in the form of web app use (think paypal platforms) but have on public display their holdings.
And likely the masses will deal in their regional denomination (pesos dollars sheckles).
Crypto will remain a back room that manages the value, not unlike the bank system today, 99% of the public are not involved.

tldr;