If anyone thinks the big banks and big governments are going to allow a decentralized currency commenced anonymously to overthrow the status quo or even allow the market to determine which system will prevail is delusional.
I think the only reason why some central banks or governments have allowed Bitcoin unrestricted is because they are hoping the market will reject Bitcoin. That and also because to restrict the use of Bitcoin would be inconsistent with the free growth of technology and the market. This, I fear, will change once Bitcoin starts becoming a more dominant presence.
No system of money or thought or religion or philosophy can expand without persecution.