Any prediction on Bitcoin is unsure by nature because nobody can really be sure of what can be...we do not have the power to exactly see what can be days ahead and we do not have the magic wand to make things happen the way we imagined them to be. Therefore, the $400K prediction is just that...prediction! Nothing more, nothing less. Personally, I am expecting some upward movement with Bitcoin due to the halving effect (we can say it can just be a self-fulfilling prediction or whatever) but there is a big chance that it can never go beyond the $20K level though that can be true in 2021. Of course, not unless China will open its big market and many other big countries (including India and Russia) will suddenly approve Bitcoin then maybe there is a slim chance for the $400K projection. Otherwise, this is just a pipe dream.