Upgrade time will not be 4-5 years until someone actually upgrades in 4-5 yrs.... and that just isn't going to happen any time soon. The last bid had over 150 FO vacancies in just DFW/ORD, close to 200 system wide, with only about 20 CA vacancies. And some of the CA's won't be backfilled.
I definitely wouldn't come here "hoping" the upgrade will come down "soon" regardless of what anyones friend in training/brother/cousin/gardner/roomates-ex-sister-in-law's-boyfriend "thinks" *might* happen.