Ann Marie’s Answer
I think that it's become easier for students to apply to more colleges than ever before. With the advancement of the Common Application and online transfer of documents, students are only limited by the cost of the college applications. Many colleges offer to waive this fee, making it even easier for students to apply to multiple colleges. You're correct that schools often take the same amount of students year after year. Many colleges either don't want to become too big or they simply don't have the physical space to accommodate a huge increase in students. I haven't looked, but I'd be interested to know how many students from a college's wait list are offered a spot once students who were accepted start committing to one college.
I do think that as we move away from what we think of as the traditional college experience (a four year experience, living on campus and going to class) and towards an online education (in whole or in part) we may see an increase in the number of students accepted to some colleges. Until then, I think the trend you're seeing may continue for a little bit longer. It's frustrating when you're the one waiting to hear from your first choice school.
Good luck to you.