If a fork can be made to "delete" the MtGox coins, a fork can be made to delete your wallet too. You have no idea what you are asking for.

Also - the number of coins sold (about 30,000) are roughly what are newly minted per month anyway. I don't think MtGox crashed the price. What happened is that it went up so fast in December that lots of people independently made the decision to take profits. I know I sold some of my coins for that reason.