is this a bad idea--getting rid of the microwave in favor of this other thing? if you have one of these please post your thoughts. thanks.
I'm not a huge proponent of having a MW (though I do have one and use it), but the way it cooks - causing water molecules within food to heat and thereby transfer heat to the food is unique. All other means of baking rely on heat penetrating from the outside, so while some methods may speed up this process relative to conventional baking, none can exactly replace the speed that a MW heats food.
If you rely on a MW to reheat frozen prepared food, whether home-made or purchased, I doubt the other types of oven technologies will be anywhere near as fast. I make up and freeze a lot of food dishes that are reheated in the MW, and I use it to cook frozen, and some fresh, vegetables very quickly.
Perhaps you should consider having a convection/steam oven as your primary oven and keep a MW.