I am actually about to quit my day-job to work full time "on bitcoin". It is very exciting, however I will be soon working strictly for bitcoins with my employment. This should be a very interesting chapter in my life and I am excited to start working for a dedicated, serious bitcoin company.
Well all the best to you for this and i hope you wont regret this decision in future and earn a good amount of bitcoins as a regular incomr.
But for me i will not do this because i consider this a really risky option to be dependent only on bitcoins for full time income.