Is there any chance(s)for Ethereum to be the next biggest cryptocurrency throughout the world?
This is a complex issue. There is a possibility that Ethereum will become the most popular cryptocurrency. The air is already used in 90 percent of the ICO.
But it is very unlikely that Ethereum will become the most expensive currency.
I don't think it has to be the most expensive necessarily for it to overtake bitcoin.
So long as it becomes just as, if not, more popular than bitcoin...