The better question may be "Will 2019 be the year of Crypto?"

It's not really a competition between BTC and the Altcoins, but between crypto and fiat. The best crypto coins will rise to the top with the best ideas to solve real problems.  

There are a lot of shit coins muddying the waters that do nothing special except hype to try to make something out of nothing.  They have no true value creator. But the legitimate projects are test beds for different ideas.  This is a good thing. The most successful ideas usually come from small nimble hungry startups rather than large corporations.

Similar to the U.S. Constitution, the founding fathers intended the individual states to be test beds for ideas where the people could vote with their feet. In theory, they would relocate to the states that best met their needs and matched their values. The same thing will happen with crypto.

Bitcoin may or may not emerge as the industry leader. It all depends on its ability to change. The first mover is not always the leader of industry.  Remember that Google was not the first search engine.  The #1 search engine in the 90s was called AltaVista.  Also, most people may not remember that Microsoft did not have the #1 word processor (Word Perfect), or the #1 spreadsheet (Lotus 123), or the #1 database (dBase), or the #1 presentation software.

2019 will be the year of the Altcoins that can provide real utility buyer demand with a real sustainable business model. That's what crypto is sorely missing and desperately needs.