Look long-term. What you should really hope is that miners that make insane profits, keep reinvesting to secure the network. I will do it as long as I can.
The security of the network also relies on strength in numbers / number of distributed nodes.
With a select few nodes doing all the work it's easier to target them for DDOS, theft, government confiscation, or even drone strike.
Some might laugh, but all they need to do is label you a terrorist, Bernard von NotHaus, the creator of the Liberty Dollar was labeled as a domestic terrorist by the FBI, and arrested, $7m gold/silver backing his money seized.
“
Attempts to undermine the legitimate currency of this country are simply a unique form of domestic terrorism,” U.S. Attorney Tompkins said in announcing the verdict. “While these forms of anti-government activities do not involve violence, they are every bit as insidious and
represent a clear and present danger to the economic stability of this country,” she added. “
We are determined to meet these threats through infiltration, disruption, and dismantling of organizations which seek to challenge the legitimacy of our democratic form of government.”
http://www.fbi.gov/charlotte/press-releases/2011/defendant-convicted-of-minting-his-own-currency
