I did an internship at SkyWest 4 years ago. At the end of it I got hired with much less time than everyone else in my class. Of course this is before everyone was getting hired at 1000 hours. Airlines haven't been hiring in months and there are tons of furloughed pilots on the street. When hiring does resume there won't be too many 1000 hour CFI's getting interviews. Doing the internship will be a foot in the door at the right time.