If this was part of a push for a world-wide standard, then it would perhaps be a good idea. Seven thousand feet being mistaken for ten thousand feet on the R/T is one of the many phraseology pitfalls. For my own peace of mind I find myself double stating all 5 figure altitudes ("climb to one-two, twelve thousand feet"). I do agree with 10 DME ARC though, having a transition layer of 1500 feet plus takes the mental gymnastics out of work things out when the pressure is low.