Petahash?
Is this a rhetorical question? If so, basically the home miner will die out due to increasing electrical costs with little to no ROI. Serious mining will definitely move into the datacenter.
2014 will probably be the death of the hobby miner.
Even datacenters will be unprofitable before the end of 2015
No matter how you slice it...difficulty will be forced to level out.
It will stabilize. If it's too unprofitable, less people will invest in miners. Less investing in miners means less production and development of miners, which means difficulty will not go up as fast, which means miners will once again become profitable, which will start a new wave of people interested, which will again result in miners becoming unprofitable, repeat..
Oh and by the way:
| Unit | Value | scientific notation | Symbol |
| 1 | | |
| Kilo | 1000 | 103 | k |
| Mega | 1.000.000 | 106 | M |
| Giga | 1.000.000.000 | 109 | G |
| Tera | 1.000.000.000.000 | 1012 | T |
| Peta | 1.000.000.000.000.000 | 1015 | P |
| Exa | 1.000.000.000.000.000.000 | 1018 | E |
| Zetta | 1.000.000.000.000.000.000.000 | 1021 | Z |
| Yotta | 1.000.000.000.000.000.000.000.000 | 1024 | Y |