Given my total instability on closed circuit now that I am in the midst of changing over from technical diving on open circuit, I am now of the opinion that the time is right for everyone to start on rebreathers from the outset. Get over the learning curve and move on from there.
To me, making the jump is akin to becoming an expert airplane pilot, and then having to fly a helicopter for the first time. Yes, they both fly, and knowing the basics of flying theory can move from one to the other. However, I am pretty confident that the newbie helicopter pilot won't be able to hover perfectly on the first lesson even if an expert at flying an airplane. Why not just learn to fly a helicopter from the outset?
