From what a friend of mine told me, many of the current older elders are still hesitant about it but CO's seem to pushing for training of younger ones. The GB wants this to happen.
It's a strange choice. I can understand wanting a generation younger than 70s-80s to replace the ageing elder bodies, but trying to appoint a lot of "elders" from age groups as young as 20s (or even early 30s) to take the lead is a big risk. Not only do they not have much life experience and are more likely to lack spiritual (or any kind of) maturity, but they are also much more likely to be susceptible to slipping into 'wordly' ways, as they have grown up surrounded by modern attitudes to politics, higher education, religious criticism, gender and sexuality, entertainment, etc.
Look at the current thread on here about Nicolas King, for example. Supposedly "exemplary" younger men who are still finding out who they are and exploring the world are more likely to stray from the path the GB would want than are older, more settled ones who tend to be vested in staying with the congregation especially if they have a wife, kids, etc. So if the current bodies of elders do cave in and start appointing a lot more very young men it could come back to bite the org in many ways, not just in alienating the more aged members of the congregations.
But then, as some have said here before, the GB tend to be their own worst enemies, and shoot themselves in the foot a lot.