Hmmm.... I guess that will be the blocksize increase. If we can successfully increase the block size and scale up, and without compromising the network, that will the greater than the reward halving. However, there is no date to that yet!
If u mean
blocksize increase in literal sense, i.e. though hard fork, then I doubt it'll ever happen. But, if u mean capacity increase through SegWit, which is equivalent to blocksize increase, then I'm unsure how the market will react to it in short term.