FWIW I can mine testnet coin very easily. In a few hours I mined about 18,000, more than enough to fund this experiment for a month.

In fact, I've been giving it a go - https://www.blocktrail.com/tBTC/address/n2GcwNsdybZrr6mbLakrwgQoWSurABHU3a I've broadcast about 30,000 transactions on testnet in the past 12 hours. It currently leaves about 4000 tx's in the mempool with and none of the blocks exceeding 750kb.

Some numbers: I moved 30testnet coins in 30,000 transactions, for a fee of 0.51 (dynamically calculated by the client). I have 18,000 testnet coins. So we can deploy this on testnet today, and see exactly what will happen.