It does not matter. If one Bitcoin will cost $252,000 USD and you can mine 3600 a day then you(all miners together) can afford to spend $907 200 000 UDS/day on electricity to mine them.
Yeah, assuming that there still are 3600 BTC mined per day! I don't think we'll achieve a price of $252000 while the block-reward is still at 25 BTC! But you're right of course, and it's just another example of the self-regulatory beauty of bitcoin mining.