If you do manage to get your medical and your licenses back, I believe you will be able to find a job instructing. Eventually you may be able to go to an airline, but don't count on it for at least 5 years and maybe even more realistically 10 years. I have some experience with this and the big issue for most airlines is not the DUI itself (once some time has past), but the inability to go to Canada. That being said I do not know how they would feel about two DUI's or a DUI and a license suspension. My feeling is that if you are willing to instruct for 5 to 10 years, you may have a shot, but you'd better keep everything clean during that time.