Not to put an end to this great debate, but we already offer that option. On ALL models now, you can option the convection microwave. The convection micro goes in place of the microwave and we delete the oven. You then get an extra pan drawer below.
As for the "oven versus convention debate". Might as well make it Republicans versus Democrats. Either party saying the other is stupid. lol.
At a show its about 50-50. People will walk in.
Person #1 "that oven is just stupid...the oven is worthless, I only use it for storage. Convection would be so much better"
Person #2 "OMG I'm so glad there is an oven. I would not buy one without. We dry camp a lot and the last thing I want to do is turn on the gen to cook. I also do a lot of baking and the convection just doesn't get it right."
As you can see...everyone is right. It's all in how you use it. We stopped trying to figure out the best scenario. There isn't one. So Option #305 is Convection instead of oven.
As for a retro fit. The convection is easy, they make them the same size as microwaves now...so that is a plug and play. If you're handy, you can take the oven out, and build another drawer to go there. Or buy a new motorhome. that's my suggestions