PG - Tyler Ennis
SG - Andrew Wiggins
SF - Anthony Bennett
PF - Tristan Thompson
C - Kelly Olynyk
SG - Nick Stauskas
C/PF - Trey Liles
SG - Corey Joseph
PG - Xavier Rathan-Mayes
C - Samuel Dalembert (?)
Just off the top of my head... I'm most likely missing some people.
Cory Joseph will be our starting PG for sure imo, Ennis could be good but he's barely an NBA player as of now.
CoJo has become a real good player for the Spurs but unfortunately plays behind Parker, I'm of the impression that he can start on a few teams in this league.
Bennett is really bad.
PG: CoJo
SG: Stauskas (Right now this position is kinda shallow for us, Stauskas can be good though and if he hits his potential complements Wiggins very well)
SF: Wiggins
PF: Thompson
C: Olynyk (He's really good btw, he'll have a couple all star games imo once the Celtics become competitive again)
Bench:
Ennis
Bennett
Nicholson
Sacre/Lyles/Powell
A wing in the Euro League, let's say Andy Rautins or something like that. Rathan-Mayes is good as well.
It's a good enough team to qualify for the Olympics in 2016 but I doubt we'd be capable of doing much damage at this point once we get there.
2020 is a whole different story, Wiggins and Olynyk/Thompson/Cojo/Ennis/Stauskas will be in their primes, and we have a more or less consistent pipeline of Canadian NBA talent so I'm sure there will be a couple other players who have become big names in their own right (Potentially Jamal Murray, Justin Jackson, etc.)
We might get lucky as well with Thon Maker, the top prospect (Well, his stock has kind of dropped, but I think with his toolset he's gonna climb real high once he starts college ball). for 2016 or 2017, he's been all over the place in terms of Nationality, but he's playing his high school ball in Orangeville, so he'll be living in Canada when he turns 18, and since he hasn't really stayed put in one country his whole life, who knows who he decides to represent.
Thon Maker has a playstyle somewhere in between Kevin Durant and Kevin Garnett.