The iPod Touch as a gateway device may have been true a few years ago, but it has been replaced by older iPhones and the iPad mini as gateway devices. Sales figures don't lie. iPod Touch sales are down, way down.
Contrast this consistent reduction in iPod Touch sales with monstrous growth in iPhone 6 sales, it is painfully obvious that the Touch is dying.
I agree. It kinda comes down to this:
Old iPhones make better (or at least equal to) iPods than iPod Touches.