In 2020, I think Altcoins will have further adoption. Maybe we can have like somewhere in 500 USD at that time. Wondering how high difficulty will be at that point and how much advancement is required to mine a bitcoin. Or what will happen to the bloated blockchain size at that time. They might need to do hard fork for bitcoin to advance further but if none will be done then altcoins will take over.

But no one can predict the future so we just have to see it to believe it.