I think that governments need to regulate Bitcoin eventually for the mass adoption. In the end, regulation means becoming officially legal to use it under some conditions. But the regulations shouldn't be too strict. Otherwise, Bitcoin users won't be happy about it and Bitcoin can lose its meaning.
Bitcoin shouldn't be regulated not even a bit because it will kill the concept of bitcoin's existence and even if government starts to implement regulations mildly, it won't take long to fully regulate Bitcoin and make it like any other centralized wallet payment system. They have been trying to regulate Bitcoin unsuccessfully from long time. Regardless legal or illegal users will figure out a way to use Bitcoin if they want to use it so we shouldn't be compromising on basic rules of bitcoin to make it legal.
You should first define what regulation is. For instance, Bitcoin should be recognized by law and regulated in the way that people would be allowed to demand the return of their stolen coins in court, be able to pay their employees in bitcoin without being accused of giving out worthless substitutes of money. IMO if government demands taxes to be paid on the coins that you hold they should allow for these taxes to be paid in bitcoin.