It is possible but i don't think m-Eth or similar pump&dump scamcoins will succeed it. It can be done by only big companies like Microsoft, Apple, Google etc. Even if those companies wanted to have their own global currency, they need to make huge investments which may result in failing everything.
That's why bitcoin needs to fail first to get replaced by something else. Only after that there will be a new one.
Finally! There's only a few people who realizes that Eth is a scamcoin and a lot of people are taking huge investments in it. Bitcoin is probably the only trusted coin there is. Well, litecoin almost made it but I'm not sure exactly what happened.
The ETC could also be a scam coin as it is controlled by the DAO hackers. We might need a clean start of the Ethereum from the beginning.