I agree that playing the way Henderson played isn't the kind of way one wants to end a career. However a year of college ball is a lot to commit to due to one sub par game against a very good opponent. The performance can honestly be as much attributed to the play and ability of his teammates as much as his play. Take Henderson and Cunningham and switch teams. Henderson goes for 25 and 8 against Duke with that Villanova group.
I have no idea whether he stays and if asked my opinion on what he should do I wouldn't be able to fully commit to either decision. He is skilled enough to play in the NBA, he is physically mature enough, he has a good head on his shoulders and an NBA pedigree. He could very easily go pro and continue his development. Or he could stay in college, where there is the significant upside of continuing to learn to take over and completely dictate the game, much in the way Grant Hill did in 1994. He is not in a financial bind. If he enjoys the college process, stay in college.
His silence to me shows an understanding of the need to think things through.