The NBA needs to bump up D-Leaguers salaries first before we talk about the D-League being a viable option.
If the NBA is serious about making the D-League a legitimate, viable option for an 18 year old, they need to up those salaries at least to $55,000, $45,000, and $40,000. It's not going to compete with going international, but it might be enough to entice kids to skip college, play a year or two in the D-League to learn NBA systems, life on the road, etc. Plus with international, the game is a lot different over there than it is in college.
The NBA is going to be flush with new TV money once the next contract starts. Might as well reinvest it in the D-League to make it more attractive.