Quote from: TierNolan on November 12, 2015, 02:19:31 PM

For IBLTs to operate with O(1) efficiency, there needs to be some method to boost efficiency of keeping all miners' memory pools aligned.

The incentive is economic as Gavin mentioned earlier.

Quote from: Gavin Andresen on October 27, 2014, 01:27:22 PM

RE: O(1) versus O(some-function-of-total-number-of-transactions):

Yes, it will depend on whether or not the number of differences goes up as the number of transactions goes up.

The incentives align so it is in everybody's best interest to make the differences as small as possible. I wouldn't be surprised if that causes innovations to drive the actual size to O(1) minus an increasing constant, as code gets better at predicting which transactions our peers do or don't have.

The gain actually achievable towards O(1) is not really important. What is important is seeing the implementation of some level of block propagation efficiency that is native to all nodes, i.e. not just elite miners on a sub-network.