guess what? not really profitable unless the difficulty suddenly decreased by at least 20% within the next re-targeting, and/or the price of bitcoin suddenly skyrocketed, otherwise bitcoin mining would not be as profitable as normal even if electricity was free.
block reward is halving every 210000 blocks, that is one of the reason mining is not profitable as well.
Price of bitcoin in the future is irrelevant. You guys really need to apply basic economics instead of throwing out random ideas. Look:
You pay $1000 for a mining rig when BTC is $100 each.
After 5 years, it's mined 5 BTC and BTC is worth $1000 each. Nice, you've made $5000-1000=4000, right?
If you had bought BTC instead of the rig, not only would you have had LESS RISK and wasted less time keeping it running, but you'd have 10 BTC instead of just 5, or a profit of 10000-1000=9000, over twice as much. Instead, you essentially wasted $5k just to run a rig.
Quit looking at the future price of BTC and trying to use that to justify why mining is worth it.