It all depends on the distance and the methods used. If you are an expert in arbitrage that to a profit from the hold you easily add a profit from the trading.
I think that next year ETH will fight bitcoin for leadership. More and more people are getting acquainted with crypto-currencies and understand that although bitcoin was the first, other crypto-currencies are convenient for real work.
Even now, paper money is already a thing of the past. A large amount of paper money can not be "honestly" owned without proper documents. In the future, the role of paper money will be purely museum.