As more people start mining coins the payoff per coin mined is diminished (by design) to stabilize coin values and control inflation, and a lot more people are suddenly getting into mining now because it was reasonably profitable before. So I think coin values are very unlikely to dramatically increase and they are likely to gradually decrease.
Electrical power prices vary. Most power utilities implement a "tiered" pricing system where you pay more once specific power consumption thresholds are reached. Mining can be profitable up to a point, but beyond that point it costs more money to run (in electricity) than it generates (in coins).
A desktop computer is poor economy for mining, the price of good hardware is very high while the return (in terms of hash outputs) is very medium. A laptop computer is even worse because, all other things being equal, it costs substantially more and it runs weaker-performing hardware. A higher-end gaming laptop is pretty much the very worst possible bang-for-the-buck choice you could make - you paid a premium for mobility and for awesome screen and audio and keyboard and all the rest, and you're planning to plunk the thing onto a desk where it will be largely ignored while it crunches and churns. I think you'll actually be losing money once you factor in the price of replacing your dead/dying laptop after 2-3 years, the profit margins are already edgy for people with low-cost middling-performance desktop platforms.
Heavy mining runs heavy load on the GPU(s), nonstop 24x7x365. Yes, this keeps the GPU (and other) hardware running hot and heavy, it'll definitely age from the abuse after a couple years. The laptop battery and laptop cooling system(s) will also wear out quickly, laptops (even the mightiest killer gaming laptops) simply aren't designed to run the sorts of sustained abuse that decent desktops can endure.
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