If that was their plan, they probably wouldn't have telegraphed it by seizing only their US accounts, thereby giving them time to move funds and destroy evidence.

I don't think Mt. Gox will be shut down, but I do not like that they have not even addressed the issue, and I won't risk funds with them until there is some clarity around their position.

As for Bitcoin itself, anything that happens to Mt. Gox will be a temporary setback. New, compliant exchanges are opening and will continue to open.