You are confusing apples with oranges. The folks possibly "extending their contracts" (a misnomer in of itself) are seasoned 10+ year career aviators who are fully qualified in their community. Manning wise, you cannot fill those previously empty holes with brand new aviators. If those holes are now being filled with equivalent aviators (and I don't know if they actually are), it equally has no bearing on new accessions who couldn't fill those jobs. The size of the fleet in coming years does, as well as I'm sure plenty of other factors, but this is something I would absolutely not stress about in your shoes.