As for "diversifying", Sunwing is to the best of my knowledge not altering its course or venturing into new and uncharted territories as far as flying goes.
Don't you think that increasing your fleet size by 50% in one year is venturing into new markets? More power to them, but I really question doing so in a very competitive (and possibly shrinking) marketplace. I guess we'll see if the higher ups have the stomach to slug it out for what could be a very long and tough couple of years. It is definitely not for the faint of heart.