To add my 5 P's worth: a number of airlines recently asked by a British FTO answered that in its "current" form, they would NOT be interested in MPL-trained FOs...
Seems that ICAO's drive to introduce the MPL may face an uphill struggle with a number of operators - at least this side of the pond.
I can't help but think, if it ain't broke, don't fix it.
Cheers