I believe it is possible to create a cryptocurrency with Hyperledger (Though a bit unconventional, perhaps). As in this question, chaincode can accomplish this. Would it then be possible for a token created in a Hyperledger network to be traded on exchanges, should they want to list the tokens?
What would be the downsides to attempting this? One might say that the network wouldn't be as public as others. Then again, neither is Ripple's XRP.
There is a Token feature in the alpha release of 2.0, you can check it out: https://hyperledger-fabric.readthedocs.io/en/latest/whatsnew.html#fabtoken