It's possible, like as is happening at the BBC, that this will have the opposite effect of what is intended. Some of slightly less paid execs will compare themselves with the better paid ones- both within their own company and in other companies- and will kick up a fuss, so it will push exec pay up further.
It's right that there should be large differentials to encourage people to take extra responsibility and to reward success, and to help attract the best candidates...but, having worked at something approaching this level I felt it seemed like an old boys' network where they would look after each other, hand out large pay increases to each other even in not so good times. We would pay someone £200000 a year because we were keen to get the best and they had been earning £180000 and had previously been headhunted from somewhere paying £150000, but when we got them we found they ppromised a lot but delivered little. A lot of these people come in promising the earth, shake things up a bit and then leave before anyone realises they have not helped at all, just left a mess.
Is it a good idea? I'm not sure overall. We'll have to wait and see