Not exactly the next bitcoin but the next best coin out there asides from bitcoin probably because it's potential and the demand for there is fairly increasing. And stating the fact that it one of the leading coins in the alternative coins in the cryptomarket so yeah it is a next big thing we can expect a lot from ethereum but in terms of faring with bitcoin I personally it is quite not there yet.
When it comes to cryptocurrency, its notoriously volatile and unpredictable. At current, bitcoin is the most dominant coin on the whole market. First up, although its the oldest one, bitcoin has the highest price of the market, also sometimes other coins prices depend on bitcoin price. Anyway, bitcoin is a fundamental unit in terms of digital currency, to replace of bitcoin, ethereum has to fight for a very long time. I believe, however, ethereum is the next big coin in crypto market. Because obviously, Eth shows us high potential as well as great security, people are more likely to keep an eye on ethereum, because compare to bitcoin , its affordable for them to buy. In a nutshell, these two coins bring us many benefits, but whether ethereum can take place of bitcoin or not, its stil a vague answer.