Might be referring to the recent issue regarding different versions of bitcoin, XT and Core in particular. Because the network couldn't reach to a consensus or even a compromise, some people believe that the network would be split in different parties believing in different bitcoin implementations and might remain like that until consensus is finally reached. The XT guys are stressing out that if we really want to see widespread adoption, we should take into consideration that 1MB block size limit is pretty small to that matter whereas Core guys believe that 1MB block size limit is in itself sufficient to handle future transactions regardless of growth and should only change once the need for it arises.