Can understand that perfectly, I have a little 4 berth Sprite Alpine, it is great for its age of 20, in truth it is a bit to small for us but we are really attached to it already, I know I feel exactly the same as you if we do ever part with it.
If you have room why not keep both? the motorhomes are great but don't you have to pack everything away if you want to go out for the day (unless you tow a little car behind, seen that today it was a little Scicento car) thats where caravans are great, leave it on camp all set up and go off out and come back without having to set all up again, both have their advatages and disadvantages I guess.