I agree with you on this. I tell you how I know this to be true for me. With every keyboard that I've owned in the past there was something about its successor that I really wanted that it got to the point where I had to have it! As much as I really enjoyed the T3 for the two years or so I owned it, the T4 was what I really wanted, the vocals, choirs, ambient styles etc... I don't have anywhere near the same sentiments with the T4's successor, if anything I have already forgotten about it. That's only because the T4 is still everything I ever need in a keyboard and there's nothing on the T5 that grabs me in any way like any of the other successors did. That's not because the T5 is bad, it's more of a testament of how good the T4 still is and will be for many many years.

It would have to take something very special indeed to consider moving away from the T4 and I can't see anything of that description yet. It would have to be a huge difference.