"Ethereum can handle around 15 Ts./sec before transactions are rejected. You might think: “Well, that’s more than Bitcoin with 7 Ts./ sec” but here’s the catch: Ethereum is not about coin transactions only, the founders sold the project as the world’s universal computer to handle everything from decentralized Ubers to P2P-cloudstorage and more.
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The network is headed for around 200k “transactions” a day. A number Bitcoin saw around a year ago. Notice the exponential rise over the last few weeks, where is it coming from? The price of ETH is 1 factor for sure, but as devs start to make websites like “Etheroll” things add up quite fast. A 12 second block only allows for 180 transactions. This means that 200 active gamblers can take up all the Ethereum mining resources. And this is just 1 Dapp."
https://medium.com/@yobanjo/how-etheroll-and-other-dapps-will-kill-ethereum-e973d8e1c465
...
The network is headed for around 200k “transactions” a day. A number Bitcoin saw around a year ago. Notice the exponential rise over the last few weeks, where is it coming from? The price of ETH is 1 factor for sure, but as devs start to make websites like “Etheroll” things add up quite fast. A 12 second block only allows for 180 transactions. This means that 200 active gamblers can take up all the Ethereum mining resources. And this is just 1 Dapp."
https://medium.com/@yobanjo/how-etheroll-and-other-dapps-will-kill-ethereum-e973d8e1c465