I have a friend who works for Rynair (Tech Ops - so not really his field). I asked him about this earlier this week. Apparently it has been going around the company as a rumour, along with a whole host of other crazy changes, he thinks it's all just scare mongering by the media. I'm inclined to believe him, as I don't think any company is barmy enough to do this.
If I did every have to fly on a plane with paid for toilets, EVEN then I'd be very wary about wearing a nappy in public in such a confined atmosphere.