Even though Ethereum is a good platform, until they don't resolve the scalability issue it won't go mainstream. Moreover, the fact you need to pay for every transaction on the network is a pain in the ass for many users, although there's a proposal to let the smart contract pay for user's fees, which is the way to go in my opinion.

As other mentioned, EOS is the one to look at. It has been designed from scratch to scale, it doesn't have transaction fees and it is damn fast (0.5 sec/block). Block.one is currently working on an iOS app (Android coming later hopefully :D) that you can use to securely hold your keys in your device and moreover, to be able to actually use EOS tokens. No more that bullshit of storing tokens and digging them on the ground but actually using them! In my opinion is the project that seems more likely to take blockchain mainstream to this date. EOS.io is designed in such way that it will allow dapps such as Steemit to run on it. User-friendly usernames like on steemit and more, it's really rich in features!

Cardano looks very promising as well, let's see!