I don't know who the guy is, but selling in Nov 2013 was not a bad call, especially if a guy had use for money in 2014.  I'll hope the same does not end up applying to 2015 as well.

I also would neither agree nor dis-agree with his contention about protocol level deficiencies.  The contention rests very heavily on how Bitcoin is used in native form.  If as backing for sidechains, for instance, I would tentatively disagree.  If as a native exchange currency for the human inhabitants of planet earth to conduct even a small fraction of their general economic transactions in the 21st century, I could not agree more.

edit: slight