This is where economics in the economy come in to play risks and reward, at the moment federation/oracles/OT all are owned by the entities that want you to trust them with your Bitcoin, what happens there after is business. (And federation/oracles/OT are magnitudes more trusted than anything before) What entities do to build trust or create value, if it has any impact on miners it is catered for in the existing incentive structure.
There's something important to be said here about OT (and other off-chain systems).
OT is a contract processing system that operates on
liabilities.
You'll never be able to transact with Bitcoins anywhere except on the Bitcoin blockchain, in OT or in any other system.
If we want Bitcoin to succeed as money, then we need as many Bitcoin transactions to happen as possible.
I believe sidechains transactions are the closest things to Bitcoin transactions in that they create value for the whole ecosystem and preserve the network effect.