Well, my interpretation of Canon's acknowledgement that it is a "product limitation" simply means they are not going to recall the lens to add floating rear elements. Surprise, surprise. : )
Yeah, they ain't gonna do that, that's for certain!
However, rumor has it that they did "something"...a silent update. Not really sure. All I know is that my UW0706 date coded 50L has a different finishing texture than the ones I used to have/tested. Take that with a big grain of salt however!
The viability of a software solution to the limitation is not a fantasy. In fact, it is less a fantasy than vignetting correction and PF removal. But the implementation of a software solution may well be a fantasy, given the 1DIII AF fiasco.
I am not disagreeing with you there and the IMPLEMENTATION is exactly what I am talking about. It is indeed a fantasy to hope that Canon will actually do something like that!
In any case, as I discussed and demonstrated earlier in this thread, it is a limitation that so rarely comes up for me, that I am not losing any sleep over it. Do that many people really use a 50 / 1.2L for stopped down close focusing so much that using an off-center AF point on those occasions is an issue? That would be very surprising to me. Then again, it's surprising to me how many talk about soft corners with lenses wide open, given that the corners will rarely be in the DOF at such wide apertures.
Really depends on the individual. Why would anyone buy a 50L to shoot at f4-f5.6? Why not? I am always dumbfounded by remarks like that. 





