BTC was down around $310 on Gox less than an hour ago... I think we need to give it some time to see how DOGE reacts to the halving :]
MtGox does not affect other BTC markets. They never did. They are selling cheaper to recover losses and to buy in again. They are scamming people. Reason why their price was high above the other markets. Now they want to buy in cheap. Bunch of bloodsucking leaches. Worst thing is that people fell for the whole scam!
You are right that MtGox no longer affects the Bitcoin value that much - there still is some influence (all prices go down while MtGox is
crashing) but there has been a disconnect between MtGox and the others simply because MtGox has become an "island". It was almost
impossible to get dollars or other fian in or out of MtGox after Dwolla was forced to stop providing services and they had plenty other
problems with fiat exchangers, so that is why the MtGox BTC dollar price was so extremely high - to reflect the trouble you would need
to go through to get your money out.
On top of that, they decided to halt any Bitcoin withdrawals, meaning that it became almost impossible to get your money in BTC out while it was already very difficult to get fiat currency out of MtGox - that decision was a certain way to death and the resulting crash is no more than logical, you can see the disconnect with all other exchanges that are around $600 per BTC while MtGox is at 300. IF it would be possible to transfer, that would be an easy money generator!
I was extremely lucky that two weeks ago I was considering to change my positions instead of a large diversification, move more into Doge
as well as invest in moolah, so one of the things I did was to transfer my MtGox BTC balance to Cryptsy. Just in time. I really feel bad for the people trapped in MtGox and panicing, selling at lower and lower levels to try to stop their bleeding by taking huge losses. Investors with a strong footing probably can benefit by taking the risk and effort of getting fiat money into MtGox and buying cheap BTC, then let their balance sit until MtGox has fixed their double-spend problems (detect modified / malleable TxID) and re-open withdrawals...
In other words when they "stop being an island" again...