I don't yet have a coveted airline job; I'm in the hunt. I just separated after 12 years of service and never made IP. I've done some interview prep and was asked why I've never been an IP. I replied by saying I flew the B-1, then was an ALO, flew the MC-12, then on the RC-135, and now, I'm training in the C-17 for my Reserve gig. I exceed the "mins" for TPIC time and my TT will hopefully be 3000 by the end of the year. The interview prep folks told me not making IP is understandable given my somewhat "different" path. For a while I was somewhat insecure about never having been an IP, but then I'm reminded of the variety I've had the good fortune to enjoy. I've enjoyed learning new airplanes and missions and wouldn't change a thing. That being said, a year or two from now when I'm not receiving any calls for interviews may drive me to change my mind. I'd say if you meet the mins, apply, update and let the airlines say no.