Are you implying that there are people who get accepted to those programs but don't get free tuition because of limits to those scholarships? Or are you talking about the talented high school students who aren't quite "good" enough to get accepted to one of these schools? If it's the latter then it's not really fair to only include the number of students who get free tuition from the top 5 or so schools. There are many other good private and public schools which provide partial or full scholarships for good students. Some examples include Texas A&M, Duke, and Dartmouth[1].

Also, any high schooler in Georgia who graduates with at least a 3.0 GPA gets 4 years worth of tuition to an in-state university (including Georgia Tech) as long as they hold that GPA through college[2]. The University of Alabama has something similar as well. There are other optiosn which base the tuition scholarships on ACT scores [3]. Here are 26 schools with achievement-based and 15 schools with need-based scholarships [4] (There's starting to be some overlap in my lists)

These don't all include the total cost (housing and food), but there are other grants and scholarships that could help with that. I'm sure part of the problem is making kids aware of these opportunities. I can see how, if they don't have good guidance counselors, they may just assume nothing like them exists. It would be interesting to see some statistics on how many students take advantage of these opportunities. (And just to be clear, I'm not implying that we can't improve the situation, only that people often underestimate the amount of help that is available)

[1] http://affordableschools.net/20-tuition-free-colleges/

[2] https://en.wikipedia.org/wiki/HOPE_Scholarship

[3] http://panthersfutures.weebly.com/colleges-with-free-tuition...

[4] http://www.advantageedu.com/blog/2008/100-free-college-rides...