The current breeding system is perfect, just with the idea of retaining parents the market would collapse, it would be easier to look for shinies by egg, competitive 5x31+natu would be worthless since they would be so easy to breed, farming dittos, magikarps, breeds by egg group, all of that would be lost, much of the economy is based on breeding, supply and demand would be completely absurd with this suggest.
If you have not been playing for a long time, of course it will be difficult and rare to lose your breeders, but at the end of the day this is an MMO, the difficulty gives quality to the hours of play you give it, you entertain yourself, you strive and have fun, reaching your first million pokecoins is a very nice way.
Recognizing the pokemmo market is important to know that this idea is completely absurd.