It's a wonderful idea but it's just not how the gaming industry is run. The gaming industry runs more like war machine production facility.
You pay some very good people lots of money to set things up, design how things are going to go, make up some prototype work. Then you set up for production, hire on tons of people to finish all the work. Once everything is up and running and all the products are out the door you cut back to a maintenance staff while you have the very well paid, highly talented core working on the next big thing. People are dying to get into the gaming industry so bad, the job pool waxes and wains in quality a little but there's never truly a lack of new talent when you need it.
The saving grace for the industry is live cadence games. The whole subscription side of things that we don't really want to see as gamers keep this ebb and flow of employment from happening. You stretch your production schedule out a little longer to begin with. You don't hire up quite so heavily and then for the life of the game you keep releasing features and options, You run events to keep people subscribing.
I like the ideas you're proposing, It just not a method that game companies are willing to try to entertain.