We will be seeing more of this, as nations who are not amongst the welathiest in the world opt to upgrade older platforms rather thanh invest in new aircraft. In this case, the F-16 option was chosen over the F-4 upgrade: the F-16 is itself slated for replacement by the Lightning II, but Turkey has opted to play it safe and initially go with what it knows, then wait a few years as the Lightning II problems are sorted out