Yes it's possible!! Some signature campaigns pay about 0.09/month around with the avatar bonus which is more than 1 BTC a year. I'm talking about betcoin campaign.
Am also looking forward on how I will be able to earn 1BTC in a year. But somehow suggestions here are very nice that we can actually do this as possible.
For the signature one you have to be on one of the top tier ones, they are harder to get into in many cases. But yes you could get 1 BTC in a year. BUT they keep going lower and lower so hard to say long term if that will keep going. Sadly many abuse it and try to buy accounts to get in quick, or use multiple accounts.... so overall there is some problems.
Your best bet in learning a skill in next year. If you learn coding, photography, arts, mining (but getting harder), you can earn much much more long term. It all depends on what interests you on what is best. I think find a skill and use signature as a bonus. That is what I consider it.