@boots
1) people with the desire to make it so,
2) move SL servers out of the sovereign jurisdiction of any & every other nation,
3) re-powering & re-connecting said servers to the Internet,
4) develop an economy which can produce RL value/goods to pay for it all.
The location of the servers I see as the major obstacle to sovereignity. Nothing absolutely insurmountable particularly if you like the idea of building a mid-ocean island or living permanently in Antarctica.
@boots
Aaah so true. I have actually made are reasonable amount of RL money, speculating and trading in Lindens. But 'work' within SL, while it makes a few Linden, rarely earns enough to make it worthwhile. Using SL and Linden as a marketing tool for one's RL commercial/artistic activities on the other hand can be quite lucrative but still not the same as having a national import/export/manufacturing/primary production base.
Unfortunately. :(