We know the feeling. The expense of maintaining a home while you're on the road and not using it can be debilitating. My problem is I was raised on a farm and enjoy gardening as much as I do traveling in the RV, and generally feel more secure with a home base.
The wife enjoys it too, but complains it gets harder as we age and would just as soon go full time. But then at 78 (as of the 21st), and with fibromyalgia, she finds climbing RV stairs more difficult each year; that results in my disembarking the coach at parks and roadsides to explore most sights along a route by myself - that wasn't the case a few years ago.
I think we just have too much stuff to not have a stick house anyway, and daughters and grown grandkids that wouldn't know where to go if our home wasn't there for them on occasion. And at least if we went full time our 37' coach wouldn't be big enough, so like you surmise, we'd have to trade up.
Joel