Yes, people can trade into a resort that has higher maintenance fees than the one at which they own, but only after owners have had the first opportunity to book those rooms. That four-month booking advantage is the premium you're "buying" by owning at one resort over another. I think it's an individual choice as to whether this perk is worth the expense of a particular resorts maintenance fees.
Are you advocating doing away with the ability to book at non-home resorts? In my eye, that's one of the biggest benefits to
DVC -- the ability to return to WDW year after year, and still have new and exciting places to explore.
Another option would be to totally restructure the way DVC is set up, so that there's a single overhead cost for the entire club, with all members paying the same maintenance fee. I'm not a real estate lawyer, but my first impression is that this would be impossible under Florida timeshare laws, as each resort is sold as a separate entity. Someone with a little more savvy on the intricacies of how DVC is organized and how Florida law works can correct me if I'm wrong.
To be honest, I don't think it's that big of a problem. If anyone is truly upset that they're paying an unjust portion of the overall DVC costs because they own at a particular resort, they always have the option of selling and buying at a resort with cheaper fees.
I'm not sure I agree with your wear and tear point.
If rooms are available for non-home members to book, that means the owners are staying somewhere else, and are presumably causing comparable wear and tear at that location. From a strict wear and tear perspective, I think it pretty much works itself out in the end. Repainting a room and replacing furniture at SSR costs about the same as it would at BCV.
I don't necessarily agree with a premise that rooms and furniture wear out faster at one resort over another because of popularity, either. This would presume that large blocks of rooms at the resorts with cheaper maintenance fees sit empty for significant periods of time. Yes, it's easier to book at SSR and OKW than it is at smaller resorts -- but only up to a point. Some DVC resorts may have higher occupancy rates than others, but I'm betting the difference isn't significant. Economic downturn aside, Disney does a darn good job of keeping rooms filled.