Bitcoin Core developer Gavin Andresen today proposed a hard fork change for Bitcoin XT in order to allow for an increased block size limit on the Bitcoin network. So far, however, it has failed to appease most critics of his previous proposals to increase the block size limit.
It is widely agreed that at some point an increase of the block size limit will be needed to allow the Bitcoin network to handle more than seven transactions per second. The Bitcoin Core development team, however, has so far not been able to reach consensus on the correct timing and strategy to accomplish this.
Convinced that time for debate is running out, Andresen has therefore elected to shift his efforts to Mike Hearn’s Bitcoin XT, a fork of Bitcoin Core. If Bitcoin XT overtakes Bitcoin Core, Andresen expects to be able to introduce bigger blocks on the network through this fork. He believes this would incentivise Bitcoin Core to adopt bigger blocks as well, or become irrelevant, as the two versions would become incompatible otherwise.