Just an update.. I heard back from Ms. Lopez and she assured me that I will be fine waiting to hear from other schools before paying my deposit. The class has never been overfilled before April 15th, but if for some reason it does then the university has a plan. As everyone mentioned, they cannot force anyone to accept an offer before the April 15th deadline. I most definitely feel better knowing I have it in writing and she even encouraged me to wait to hear from other programs.
I read in last year's thread that they accepted about 160 initially, however, everyone didn't accept. So if for some miracle we all accept by/before April 15th, then they'll take us and we'll get bigger classrooms I suppose.