Who knows, but he is right, (even if by accident) they *won't* cost 5UK pounds since that would make other options (like LED lamps) more economic. (well maybe they will for a very few die hards with more money than sense. There's always some of those!)
The even less efficient halogen down lights aren't being phased out just yet, so the likely outcome may in fact be negative rather than positive for the environment.
MrT.