They are also highly profitable businesses, and you can be sure more investor will want to setup exchanges to serve their local community.
However, it will take time for new exchanges to build up your reputation and to work with their respective local authority for the right operating license.
These will naturally replace the needs for cross boarder transaction with Mtgox.
They are anything but decentralized, therein lies the problem. MTGox is only a problem because it was one first exchanges, naturally without a lot of other options they carried 80% of trade, which makes it dangerous to the market as a whole. This is changing with more exchanges starting to come online.
We need a true p2p exchange platform to truly decentralize it. Though Gox and others are still necessary as intermediaries from coin to fiat currency.