I think Bitcoin $20,000 is basically sure now.
What about Ethereum at $15000 though? that seems difficult
No way, Ethereum is having so many problems scaling tat I don't see it making it into the $5 figure territory ever, because the thing just collapses when people want to buy crowded ICOs. Im sure we are going to see it hit $1000 (well not sure, but likely) and after that there will be a selloff, which will get worse due some technical problems arising. I wouldn't count my money on Ethereum or any alt whatsoever, im %100 on Bitcoin at this point.