I first saw Motum play at the Under 19 Four Nations tournament in Melbourne prior to the 2009 Under 19 Worlds. Of the Aussies, it was him, Delly and Broekhoff that stood out, so it has been no surprise to see the success they have had over the past four years at the college level.
As for the NBA, I don't think there is much doubt that Motum could play at that level, but whether he will get drafted, I would say probably not. I think he will most likely go down the same path as his fellow WSU Aussie Alum, Aron Baynes, in that he'll go straight to Europe, continue to rise through the ranks there up to the Euroleague, and start getting serious NBA attention in four years time after a coming out party at the 2016 Olympics in Rio.
A 6'10" mobile big who can score with efficiency inside, and step out to hit the three ball at an above average clip. That is a valuable asset for any team, and one Aussie basketball fans should be excited about seeing on a regular basis over the next decade. Especially given the scoring issues that have plagued the Boomers in recent times.