Why don't you think that Disney can change their mind about something that wasn't well thought out anyway. I had never seen where it was ever offered "for life", but since I don't stay on site, it is possible. What isn't possible is for people to get upset because what they probably paid only $10.00 for 10 years ago is no longer valid. Times and rules change. Where not talking thousands of dollars per individual here.
If it was offered I don't think I ever would have brought it back with me. The one time I did purchase one (the only time I stayed on-site) I found that I didn't use it all that often, only at meal time. I refuse to lug it around the parks all day so I wouldn't have used it on the way out. The room I had was about a gazillion miles from the fountain and after a long day at the parks the last think I wanted to do was walk another mile to get a damn drink. I bought some drinks offsite and used the fridge to keep it cool. I also, as a matter of personal principle, would not haul a cup from home just so I didn't have to spend another $14.00 for a new mug. Just seems petty to me.
Didn't I read recently that Disney had backed off some of the benefits that had been extended to DVC people and AP folks, that amounted to a lot more then the few buck it cost for a mug. Why does anything think that, if the life time deal, did exist Disney would have a problem with saying "Not anymore"?