I suppose it wouldn't be that hard to work around if people really wanted to.
Rumor is that it had reliability issues (and I'm seeing that with my own MagSafe plug), but of course no official word.
I have a pair of high-end AKG headphones that uses a "mini-XLR" connection. This is a non-standard variant of the popular 3-pin XLR used throughout pro audio equipment. When the provided cable that converts mini-XLR to 3.5mm TRS started failing, I went onto Amazon and found a generic $11 cable, but within a week of use it became clear that it was poorly made, with a metal cap acting as the only source of strain relief.
I've ordered another adapter, one that adapts the plug to 3.5mm without a cable, and it also costs $11. Not as bad cost-wise as some Apple device cables, but fingers crossed.