I feel that most people get into this far too focused on one job, and nothing else will do. If that first job isn't 737 or A320 they just don't want to know.
I went the instructor route, and never had anyone criticise my instruction. Some even requested to transfer from the more experienced older instructors to me since they liked my style. The quality of instruction is as much about attitude and personality as anything, and you have to be good enough to get through the course and test which is a very high standard. Now I'm sitting happy with the airline job I always wanted and all the hard work paid off.