Dedicated - Determined - Sports Minded Professional
If your question is specific to the NBA, then you'll need to understand their guidelines. As I recall, the last player to enter the NBA without going to college was LeBron James. Shortly after he entered the NBA, I recall the NBA changing their draft policies and while I'm not 100% certain, I believe their new rules state a player entering the NBA Draft must be out of high school two years.
Graduate Student - pursuing a Master's in Project Management
Unfortunately, we can't all have that luxury. Some people would argue, "Yes, everyone needs a college education. You need a backup plan." Others argue, "But college isn't for everyone..." And it really isn't. What matters is that as long as you have something to fall back on, something to build on, like a college education, a trade, military service, etc., college isn't a must for everyone. I have a couple of friends who opted out of college and went to either a trade school (one is into cosmetology - hair) and the other enlisted into the Navy. Both are doing very well for themselves. It really depends on you, what you envision yourself doing, and determining the best way to achieve that. If it's through a college education, great! If not, it's not the end of the world. You can still be successful by working your way up in whatever you choose.