Let's say the government does the exact same thing to make money that they do now : legislate that more money is printed. Now bitcoiners have 2 choices : use the modified code that specifically allows this transfer/money creation, or go to jail.

What do you think big players will do ?

Bitcoin is actually extra bad for this since it publishes a full financial record. To anyone with a sufficiently large source of identified transactions your accounts are an open book, if they can find just one transaction they're sure was done by you (say, paying your taxes). They don't have to contact 20 banks to find out where your funds went and who was involved, that information is public record. There is no way to pass through a bank in Saudi Arabia or some other bastard country to obscure and/or delay investigations.

Besides, having undeclared money in bitcoin is money laundering. Just having it. Penalty : up to 10 years jail time (Western Europe, and 50 km from here it's up to life in jail, gotta love the dutch). For the moment nobody's been found guilty, but that's mostly because it's only just starting to surface.

And frankly, this is exactly what we want. We may not like governments printing money and abusing it, but anybody who studied the great financial crises of the end of the 19th beginning of the 20th century, it is plainly obvious that the current situation (regularly "big financial scandal, you're probably overpaying your insurance $10") is better than what happened with the gold standard (regularly "surprise ! All your savings are gone. Oh and the same happened to the government so we're raising taxes 50%. Happy starving").