Yes, but as has been discussed extensively on other threads, most people who book at the 30-day mark and then don't use their FP's are likely AP's who change their plans for the day. Most people who are not AP's are going on specific dates based on what their trip dictates.
I don't think anyone who is park hopping would just "not bother" with their FP's that they book, but many people try to do too much in too little time, and then that would just create drama for CM's. I know you're saying it would be the guest's problem if they miss that time slot, but people have an odd way of assuming that they are entitled to being treated like royalty, even when it's not reasonable to have it done, while they're at WDW, so I'm sure that CM's would still have to hear about it and get yelled at by disappointed guests who try to blame the slow transportation, the long line at the food service, etc, for their lateness to the attraction.
I think you're wrong about park hopping being done primarily by AP's. DH and I are not AP's, and we didn't think twice about adding the park hopping to our tickets. The premium really doesn't add that much to the cost of the package, from a percentage standpoint. It only added about $110 (I think... but not much more than that) for DH and I to both park hop. Given that many here still recommend booking FP's at the second park of the day when park hopping, I don't think we're in the minority; it's not like everyone is suddenly saying "don't park hop anymore."
You're making huge assumptions about the level of FP's available at any given time, in terms of it not making a difference if passes are wasted. You may be right for most normal days, but in peak times I bet this doesn't hold true, and it's much easier to be consistent than to limit things just because the park is busier one day.
Now, if they were to offer some kind of system that allowed AP's and people who had been in the parks before to prebook park hopping fp's (so that they were reasonably sure that only people who knew how much time to allow, etc, were making use of it), then I'd say go for it. But given how little planning most first timers are doing, I don't think it's a good idea to have that open to everyone.