Its impossibleto to ENFORCE a ban.
Because al bans a based on lose of live basicly , but if the systemis set upin a way killing the user doesnot matter , the system can not be stoped,
bacause all state power is based on SINGLE point of failure ....
Nice examplesof fialing of enforcement are
http://www.thepiratebay.se or one of its proxyes ...
and silkroad 2.0
http://www.youtube.com/watch?v=4VDbNn84zBs wich uses TOR , witch even is availeble from china and Iran.
you simply can not kill a hydra with multiple heads its that simple.
btw the guy is smart, by saying bitcoin does not have a future..
he gave putin valid reasons not want to try ban it.
and if it grows russia will use it to bypass any sanctions.
like Iran does.