The same thing would still happen though. When it turns out that the MtGox stellar gateway can't actually make good on any of its IOU's, the MtGox!USD and MtGox

The same thing would still happen though. When it turns out that the MtGox stellar gateway can't actually make good on any of its IOU's, the MtGox!USD and MtGox!BTC will immediately become worthless and any one who hoarded them will feel the pain. The biggest problem with MtGox was that an untrustworthy entity was trusted with too many (much?) assets. We had a hunch about the amount of assets, but no one an exact amount, that's the first thing Stellar would solve, if I understand correctly Stellar would reveal MtGox's total outstanding assets. A bank would always have a large outstanding total though, it's their main value. Perhaps Stellar would make visualising and understanding debt of banks easier so it would also be easier for authorities to check on them. Who knows, perhaps there's banks today with much less credit than they debit. With all the digital transactions going on, we're trusting banks with way too much.