I really, really hope Canon doesn't phase out the 24/105L. It is such a fabulous lens.... and for what? A crappy 24-70 F4! No thanks...
If they do and my 24-105 ever fails and is unserviceable, ill spring for the 24-70 f/2.8 II
I doubt whether the 24-70 f/4 is crappy. It is only that the 24-105L has been bought by most users as a kit lens that the 24-70 appears to be a waste of space. However, someone not having the 24-105 has an option of getting a decent 24-70 f/4L which can do reasonable close up work in a single lens. I see many prosumers opting for this lens (as a first L lens) primarily for this reason.
BTW, I agree with you that if the 24-105 fails, even I would upgrade to the 24-70 f/2.8 II - actually I might upgrade sooner without waiting for the 24-105 to fail
1DX, 5D3, 600D, RX100
16-35L, 24-70L II, 70-200L II, 100-400L II, 50L, 85L II, 135L, 17TSE, 24TSE, 40, 100 macro, 18-55 II, 55-250 II, 1.4x III, 2x III, 600RT x 4
When it comes to gear, it is better to vote with your wallet. Bitching on online forums like a lunatic doesn't get you anywhere!