Looks like they may finally be changing the rules surrounding declaring.
"Another proposal to be considered by the Council will make the process of declaring for the NBA draft more flexible for students competing in NCAA men’s basketball. The proposal moves back the date by which students must declare for the draft and allows them to declare more than once in a college career. The declaration date is now the day before the first day of the spring National Letter of Intent signing period; the new date would be 10 days after the NBA combine. The most recent NBA combine was held May 13-17, 2015. Additionally, if the proposal were adopted, students could try out with different NBA teams and still return to school."
2016 NCAA Convention legislation: Division I
"Another proposal to be considered by the Council will make the process of declaring for the NBA draft more flexible for students competing in NCAA men’s basketball. The proposal moves back the date by which students must declare for the draft and allows them to declare more than once in a college career. The declaration date is now the day before the first day of the spring National Letter of Intent signing period; the new date would be 10 days after the NBA combine. The most recent NBA combine was held May 13-17, 2015. Additionally, if the proposal were adopted, students could try out with different NBA teams and still return to school."
2016 NCAA Convention legislation: Division I