With the emergence of the new red tracks (swerve) I summise the disapearance of Tracks is a marketing strategy. Tracks vanishes, hence customers want him more and there is a void to be filled, thus appears Swerve and everyone grabs it not caring that it is a straight repaint. Once sales of that one are waning Tracks will re-appear on the shelves and everyone will grab that one too, people cant complain then as he has already been released. Its not a totally stupid way of diffusing the repaint anoyance factor
I think we will see them as shelf warmers in 6 months