Bitcoin could have a giant increase in value because that is what BTC is worth thanks to the supply constraints and usability built in by the designer(s).

Bitcoin could go to zero if it never really 'catches' either because there is never a real need for the solution or because it is attacked effectively by those it threatens (and the resources at the disposal of such entities are vast.)

A third option which I did not really try to bring up in that entry is that Bitcoin could become a victim of it's own success and fail in the face of issues involving a combination of scaling problems + exploitation of the attack vectors that these problems open up.  I suspect that BTC values will approach zero in this instance though having control of elements of the block chain will not.

That is my current philosophy on the issue.  I have no idea which way things will go, but it is my nature to be prepared for failure and be pleasantly surprised if good results transpire.