Never heard of this. Around here, once you have a route it's yours to keep. Unless you knew it was a designated training route in advance of the bid. Sounds like a real moral buster what your living with.
In the Southern Supplement we rebid all routes every two years, in the case of this last contract, 2 then 3, which we are in now. It's actually not to bad as companies come and go, roads and traffic changes. As routes change over the years the reason you bid on them might also.
If you're high in the senority table you generally can stay where you are, middle guys like myself can really make out. For example I run around 170ish stops per day, pick up 300ish pieces, work 11ish hours a day in a 1000. Some 25yr driver for whatever reason bid me off recently and is leaving a 700 with 120 stops, no pickups, and in a 700. The dominoes fell and I didn't get that route but I'm still going to a route right next door to me that I already halfway know, does 130stops, 20ish buisnesses, one pickup of about 70pieces, and is in a 700.
I say I made out ok.