regulation =/= controlling bitcoin
of course they can not control bitcoin, bitcoin is decentralized and peer to peer. but they can control the businesses though. and also they can control the customers.
This is semantics. Basically, regulation is a light version of control. Regulate Bitcoin to the limit, and it will be of no interest to most of the players. The Wild Wild West is what seems to attract people to Bitcoin. Anyways, people will simply switch to something else which is not yet regulated.
the only difference would be the fact that your supermarket may feel safer in accepting bitcoin if it is regulated.
Once they start "regulating" Bitcoin, they won't stop until they kill it.