the demand is definitely there, the supply is not huge, so finding a job isn't difficult so the outlook is good (and there is a projected shortfall, but thats medicine in general too).
since it is not procedure heavy, you don't' make considerably more than IM (and hospitalist can definitely make more) so those that do go into the field are generally interested in endocrinology.
depends on where you are….in the community….thyroid, diabetes, hypogonadism,osteoporosis, hyperparathyroidism….in an academic setting, you may see more adrenal, pituitary issues, but you still see a lot of the bread and butter stuff…
research helps but not absolutely necessary…not really sure how important scores are…probably important to have 1st time pass and at least at the mean…
apply widely and if you are a decent USMD then you shouldn't have any issues….FMG, well its still a field that is pretty open but (as with any other specialty) you need to have higher scores and research (or at least poster presentations) will help.