In order to keep his job, he needs to go.
Hon, where in that sentence is your name?
To be honest, I would say that he is more likely to hit his bottom without a job. So, you might have just stopped him reaching the point where he will really get into recovery, rather than just rehab.
I have done the same. When I first started seeing my ex A fiance, he was living in a rented house, his ex wife had cleaned him out of furniture, he was a month away from being kicked out by the landlord and he had no money and was buying booze on almost maxed out credit cards. Bear in mind that this guy is a middle-class professional and this was really hurting his pride. Well, along I came, heard the sob story, bailed him out and started the worst 3 years of my life. I don't really do "what ifs" anymore, except for this one. What if I had not got involved instead of rescuing him?
Do you see what I'm getting at here?