If you kept the food constantly hot, it would be nasty after a few hours. Try it with something in your regular oven. It will dry out. Even if it can't dry out because of the seal, I imagine it would still be nasty.
Sucking the air out of the fridge is a great idea. That's the logic behind vacuum sealers: remove the air. Probably, the reason it's not done is because you'd have to have a powerful motor attached to your fridge, and your seals would have to much stronger. As it is now, there is little or no pressure gradient between the inside of your refridgerator and the air in your kitchen. This would add a lot to the cost of a refridgerator. And it wouldn't be significantly better than storing your leftovers in Tupperware, or even plastic bags.
I like to use plastic produce bags. See if you can talk your grocer into selling you a roll of them. They store like a roll of paper towels, and there's thousands on a roll, so it takes a few years to run out. Put your leftovers in them, and push the air out of them and then tie a knot. This keeps your food it a pretty good vacuum.
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