I agree, I probably used the wrong choice of words, but I do believe the difference is the coaching. Ireland haven't been completely overhauled by Schmidt as such. The players that played under both Kidney and Schmidt have shown sustained improvement under Schmidt. Guys like Conor Murray, who I never previously rated, have become extremely talented under Schmidt.
You expect players to come onto the international scene and spend the next couple of years building on their performances, developing into real quality players. What have we seen in 4 years of Lancaster? An unpredictable shimmying of quality in our backline, resulting in the chop and change. The chop and change is a fairly clear indicator that the coaching staff do not know how to put together a well-drilled backline; easier to drop a player and shift the blame to them, than realise your own issues. When so many players have been through the system and failed to make an impact, you wonder whether it is the players, or the system, that is at fault.
Had we gotten the coaching right in 2012, our player base would be a lot more impressive right now.