I don't think the MtGox situation has been that big an issue, worldwide, since early July's capitulation. If you look at the pattern of ask-wall busting whale purchases and ensuing bid-walls, they seem to be the work of a single entity. The modus operandi has been consistent through several major ask-wall breakthroughs.
Do you really think someone with the resources to organize such a concerted effort is restricted by some petty exchange difficulties.
It's probably either governmental, corporate or military. It's almost surely not speculators.
I give almost zero weighting to it being government or military, and a very,very low weight to it being corporate. One HNW individual, yeah, possible. A few acting together or independently, more probable.
I am not sure why you seem to think that the effort involved to buy BTC and put up bid walls is so great - it's not exactly rocket science if you have the cash and coins.
If Gox is a non-issue, why the growing price differential between Fort Gox and other exchanges ?
Don't discount one or a few HNW individuals. A lot of these people needed to be smart and non-risk averse to become wealthy in the first place. I think larger corporations won't do this: for the person making the decision there is little to gain and so much to lose. It's just like politics, don't be too edgy and don't stick out too much and you'll survive a hell of a lot longer.