They are afraid of change that takes them out of their comfort zone. (Hence the reason the sales of the T5 have been a flop compared to earlier generations) The same happened when organs moved from tab operation to button and menu operation, the traditionalist (Usually more mature) were up in arms, however these days nobody bats an eyelid, as players have moved on.
Bill
Not really a flop, T5 (61) sales where lower as the T4 sales, but the new 76 key version made up for the difference... total sale now are close to total T4 sales...
The only thing that did not happen was a growth in sales...which happened with all the previous models..