Yes, Bitcoin is self-sustaining enough. It has sustained itself so well from last 9 years. Hackers, manipulators, regulators government and many more have tried to bring it down, but it has always proved its worth. And I dont think economy has any affect on Bitcoin, neither Bitcoins adoption is strong or huge enough to affect the world economy. so go ahead dont worry about such restrictions.
When governments see growth over an industry or over a firm, it tries to make it as the government belonging. In some cases it is impossible and the same is happening with bitcoin. World economy at present doesn't have any impact because of bitcoin. But, in the falling years things will change when major adoption happen taking the growth beyond limits.