I do not believe in anything like that. many experts say if the year 2018 bitcoin prices will be very high, but until now there is no sign if the price of bitcoin will rise.
I also do not believe on that, first of all everyone knows that no one can exactly knows what will really happen may it be this year or even in incoming years. One thing i am sure about is that bitcoin will not disappear because people were now interested and willing learn about it and i guess it would last even if i die, im sure bitcoin will still be there.
they just say what they think will happen in the future against bitcoin. of course we all here can also say it, the higher the confidence to bitcoin then it will make high price predictions as well.