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.
We can afford to get full time in bitcoins but the only thing that scared us is price instability of bitcoins and that makes us to think twice before getting full time into bitcoins.