My response to this, however, is that this is exactly what E-Gold attempted to achieve, only with gold-backed currency instead. However, because of his lack of experience and education in finance and business law (he was a doctor by trade), he ended up getting knocked down very hard on charges of money laundering and operating with a money transmitter license.
As such, any entity that tried to do this alt-coin-pegged-to-the-dollar idea for exchange would have to apply for a money transmitter license and comply with some very onerous laws that are very expensive to comply and keep up with. Every member would have to supply the institution with a lot of "personally identifiable information" that would open up every market participant to the risk of identity theft if the institution has even one kink in its cyber-security armor.
Naturally the money would have to be held in an interest-bearing off shore trust that cannot be arbitrarily seized by the US government at the whim of a wildly baseless money laundering accusation.
egold handled alot of peoples FIAT taking it from one person and giving it to another. much like an exchange. its his handling of FIAT that got him in trouble because he didnt buy a licence or do any amlkyc stuff.
now coinbase are already licenced so lets say they made the altcoin pegged at a dollar, so:
1. people can deposit their fiat and buy $$coin at the fixed rate of $1.
2. people can deposit their $$coin and get fiat at their bank account.
all amlkyc approved. this is just the cashing in and cashing out gateway
now then, people can then pt their funds on private keys in in thier p2p exchange program to exchange the $$coin for bitcoin, using the decentralised programs order list.
cashing in and out gateways will always be needed but the p2p client is a new blockchain that has the double transactions per TXID
eg
instead of just (in laymens terms) having the transaction saying:
"send 1BTC from 1ssgdfgdfdfg to 1awsdesaas"
it instead says:
"send 1BTC from 1ssgdfgdfdfg to 1awsdesaas and send 650 $$coin from $pldfpgldpfg to $dldkfgldfkg"
now the deeper part of the TX.
person 1 accepts an offer from person 2
the offer has a random code that had been generated when accepting the offer
person 1 signs their transaction
person 2 signs their transaction
the send each other the signed transaction and then the 2 are joined together and signed by the random offer code
both parties then send the (technically triple signed) TX to the network. which then gets validated and mined and becomes part of the p2pblockchain
the blockchain has no reward and miners just get 0.2% of the transactions. even having the mining as part of the p2p client and set to mine only on cpu's to avoid the whole polava of racing to be the top hasher of the mining farm race.
making any p2p user having equal chance of receiving a bonus.(the total of all the 0.2% tx fees of the block)
again its just my brainfart