I think theres definitely less Ďdefinedí positions, with big men often seen (and almost expected) to be shooting threeís, whilst at the same time we're seeing guys like draymond green playing center when not so long ago, someone his size would be a small forward.
Anthony Davis is one of this new breed certainly, although he generally does play center, but is capable of shooting out to the three point line, and defending on the perimeter comfortably. Others like kristaps porzingis, Karl Anthony-towns, Lauri markannen, Durant are also in this ilk. Going back a few years, Chris bosh and dirk nowitzki probably started this shift, even LeBron has redefined positions, heís comfortably capable of playing all 5 positions at a high level. Up until about 7-10 years ago, players were pigeon holed into one position, two at a push, and never encouraged to explore their boundaries. Now, weíre seeing players operating in places on court that fit their skills, or in some cases, being taken off the court because their skills donít fit the modern style of play. Old fashioned centers are a dying breed, and often at the end of the rotation because modern big men like Davis are overwhelming them.
Theres also a shooting shift shift thatís been happening for a few years, where the likes of curry, Lillard, Kyrie Irving, klay Thomson, Durant, are rewriting the books in terms of what efficient scoring is, what is seen as effective shooting range, and asking questions of defences that have never been considered before.