I totally agree with the author of the opinion that we should not worry that bitcoin will not fall forever but i would have preferred him to say don"t worry but be wary because in the world of bitcoin everyone has to be vigilant in view of the rising tide and fall in value.
You always should be wary, whether you are trading bitcoins or A class shares.
I think that bitcoin still didnt revive its potential, max price should be around 40000. After that it would fall, but stays trading around 20000-30000 with big volatility.