the better question is, when did someone have a reign this long as the best player in the league?
Lebron's been the best since at least the 07-08 season, if not sooner; meaning this will be his 5th straight year being the best basketball player in the world
Shaq's dominance didn't last that long, so you have to go all the way back to Jordan's reign before he retired to find a 5 year stretch like this one... and even then, how many other guys have had a 5 year stretch like Bron's current one? not Bird or Magic... Kareem? Wilt?
crazy thing is, Bron's not even done... dude is just now reaching his prime and I can see him being the best basketball player on the planet for at least the next 2 years... that would make 7 straight years of dude being the best, that's probably the longest unofficial streak of all time