WHY not??!! The fact that Forex trading is conducted on OTC does hamper a trader's profitability with its utter lack of transparency and it also makes all in the industry vulnerable to manipulations in the market-making process BOTH at institutional level AND retail level. See attached document. A central exchange for forex trading would eliminate the lack of transparency issue and would put forex on par on all other financial instruments and be properly regulated. The only downside is the higher transaction fee as a result of all the organizations wanting a cut from the trades. There is a reason why forex trading is so cheap comparing to trading in other financial instruments like stocks and options that has all the fees amounting to half of the commissions collected by the broker on each transaction.
But starting an foreign exchange is REALLY hard and in fact there was already an foreign exchange that existed before
https://en.wikipedia.org/wiki/Matchbook_FX and it was quite successful at times but unfortunately it was closed down due to the lack of volume and the onset of the financial crisis of 2008. Personally I find the reason why the volume never picked up was because those "bank banks" aka liquidity providers just don't want to give up their lucrative gains in their market-making activities. I mean they can earn $million's more in shafting everybody as the ultimate market maker in the industry as illustrated by attached document, WHY would they want to give all that up by having every single of their trades scrutinized by the regulators and the public? During the good times before the financial crisis of 2008, they didn't care as much but after 2008 when the money is tight, no they are not going to do it. And since they are the backbone of the exchange just like the specialists on all of the exchanges that we have now, without them supplying the volume and facilitating trades, the exchange volume slowly dried up until there is no point to continue the exchange anymore.
Very sad, a very decent attempt to democratize financial trading for all instead of having it concentrated in the hands of the privileged and it failed.