In 20 years many things may change.
One will likely be meat protein which may be made from vegetable matter.
Vegetables may be produced by indoor grown vertical hydroponics. This may even be a function of our homes as the architecture in 20 years may provide a southern facing greenhouse wall that will provide for garden and passive solar heating.
Earthship home solar heating & garden interior photo.
Earthship 101 Youtube (and explanation of what an Earthship home is and can do for the owner) In 20 years architecture may change considerably.
Computerization in the kitchen will make it a "smart kitchen" as with the
rest of the house. Ron Popeil (of Ronco Products) was once asked what was his favorite of all the products he developed. He stated it was the little needle shaped device that scrambled a raw egg while in the shell. When the shell was cracked it poured a perfectly scrambled egg into the
skillet. But such features will be incorporated into future major appliances. (probably when patents have expired)
This hood may adjust fan exhaust speed to what is necessary and taking place
with the cooking. Lighting needs similar.
Electrolux (think vacuum cleaners) has a design team who is looking into the kitchens of the future. This stove for example is supposed to have a top you can mold wells in to cook. Once finished the surface returns to normal and you only need to wipe with a wet sponge and cloth to dry.
Similar with refrigeration. Refrigerated "future gel" may provide a refrigeration panel
on a wall. (without having to open and close the fridge all the time)
And needless to say, the microwave oven will have a switch to set from heat to cool, so that a beverage could be cooled...thus becoming a micro-refrigerator.
I've read that a home with a 6 Kw electric solar panel array would be enough to power the home. There would be a battery rack with LiPo type batteries by that time (or maybe something even better).
By that time most of us will have learned more about nutrition and adding items to our diets that may make obsolete many of the things we have known in the past. Soft drinks, dairy products, (we may make them from vegetable or grain items that are healthier) similar with bakery products where we begin to raise crops from other parts of the world that show themselves to be healthier.
One of the big problems in tody's kitchens are the abundance of single use appliances whch simply take up more room than the benefits they offer. Often they are made simply for gift giving or are cheapened to compete against a more substantial makers products. And in time they wind up in flea markets or land fills. Paid TV informercials that use celebrities to pitch these products are largely responsible for the practice. But in 20 years most people may be wiser and look back and laugh at the "Celebrity Chef" trend of the 1900's and early 2000's and how it was replaced by "Celebrity Veterinarians" as more people were choosing to stay single and have pets instead of children. (and avoid costly divorces, child custody issues or choosing to form civil unions as DINK's....double income no kids) But our social culture will have much influence on the kitchen, it's appearance, and equipment. The kitchen has often been referred to as the heart or office of the home.