Don't you precisely want to go positionless while there aren't enough players for other teams to do the same? It would be pointless to go positionless and have 5 Jimmy Butlers when the other team has 5 Kevin Durants.
You would want to be early to the transition so as to have some advantage? The Spurs in their new model 2012-2014 FEASTS on Lakers, Memphis, and Clippers in the playoffs sweeping all of them while having more trouble with the more positionless teams like Golden State (replace Lee with Barnes), Thunder, and Heat.
I think you're already late on that switch to be honest having a team where your 3 best players are a traditional PG, PF and Centre. Blake is the only one I see becoming more versatile having added a jumper and passing skills.