I hear dead people, they don't know they're dead....
It's not just the duration, (which automatically means that work will be owned by descendants, or more likely the record companies, and the contracts won't be verifiable because witnesses will be dead, as will the artist).
It's also the really dumb McCreevy 'use it or lose it' clause.
"McCreevy has made one concession to opponents of the extension, a "use it or lose it" clause, that will allow artists to reclaim the rights to a recording if the record label decides not to reissue it after 50 years."
This is meaningless, the contract the person signs will simply say something like "if copyright reverts back to the performer after 50 years, the performer agrees to automatically re-assign it to us for 1 pound (prepaid) ". So that cannot work, and he does not appear to have taken outside advice on this matter either.
It's not been properly thought through.
If he seriously wants it to support old artists then copyright should expire on their death so it doesn't become an ongoing overhead with record companies milking re-releases of dead recording artists work instead of paying new artists to record new versions.
If he seriously wants the recording to revert to the artists if it's unused then he needs to do it sooner than 50 years and needs to make it compulsory and unwaivable, so it cannot be preassigned at contract signing.
65 years retirement age, so the work should revert when the person reaches 65 at most. Although you could set a minimum of 20 years on that, so that a 50 year old can license their work for 20 years.