That's not how governments work. Governments prefer to tax things over banning them where possible (excluding activities with significant moral connotations, which are subject to different considerations).
This will be a fun ride until governments start auditing people for not reporting their bitcoin-denominated income.
Governments, especially governments with many international residents and companies, have long since passed foreign currency laws that require taxpayers to convert foreign currency transactions into the local currency for purposes of reporting income. Failure to report your bitcoin-denominated income can mean that the local tax authority (i.e., the IRS) has until the end of time to go after you for back taxes, penalties and interest, and even criminal sanctions (depending on the amount of underreporting).
That's completely different though. Banning the conversion of btc into real currency would be a huge problem for btc, who is going to accept btc in exchange for a product or service performed if they can't turn that btc into money to exchange with other individuals/companies? There needs to be a much wider acceptance of bitcoins by companies providing services/products over a longer period of time before banning the conversion(at least legitimate conversion) would no longer phase bitcoin.
Yeah, asymptotically bitcoins are either worth a ridiculous amount or nothing... what I find interesting is that all indications point to the latter requiring heavy political intervention.
This will be a fun ride until governments start auditing people for not reporting their bitcoin-denominated income.
Governments, especially governments with many international residents and companies, have long since passed foreign currency laws that require taxpayers to convert foreign currency transactions into the local currency for purposes of reporting income. Failure to report your bitcoin-denominated income can mean that the local tax authority (i.e., the IRS) has until the end of time to go after you for back taxes, penalties and interest, and even criminal sanctions (depending on the amount of underreporting).