I think they are not done redoing it, breaking up bits of it and reconfiguring it for new seasons. So... the idea of it will probably be around for a while yet. It is, after all, a very successful bag.
Ultimately, it is probably a bit of a trend bag, in and of itself.
I do firmly believe, however, that if you love this bag -- for itself, and beyond the trend-- that you ought to simply buy it and enjoy it.