Somewhat, but latency can't fall that much (speed of light). Also, over time in a successful coin the blocks get bigger, which makes the orphan problem worse, while internet and processor speeds are improving to make it better. So the two effects over time pull in opposite directions. The exact magnitude of each is hard to predict.

I'm not familiar with the situation with DRK so I can't comment on that. But it is clear that the a higher number of orphans leads to greater centralization, and also isn't very user-friendly, because people can't trust confirms if they might get reorged away.