Just math man when price of BTC = ETH that will = cost of all operations on ETH 20x.
When price will be equal the costs of sending also will be equal.
If many people will use ETH it will be victim to itself Blocksize like 20TB and high fees like BTC in 10 years.

Just look at any coin that would have 300 000 daily it will face same problem since ETH Dash size is small is easy to bash BTC but they will come to same end like BTC.
With price cost of sending are rising