I think its great that you are so interested in your future career and you are doing the research but this industry can change on a dime there is no way anyone can give you an answer to your question because who knows which regional airlines are still going to be around in 2016. Focus on studying for instrument instead of spending time researching your dream job. Take things one step at a time. This is true especially if you will be attending ATP cause I'm sure you will be drinking from a fire hose once you get there.

As for instructors being hired at minimums, literally everyone that I have known in the past year that gets minimums has a job offer and a class date in the next month. Every school is going to tell you that all of the grads get a job right as they meet minimums but that is because the airlines are hiring everyone right now

Once you get near minimums (most likely in more than two years) than you should start looking to see what regional will best suit you