I think enrollment helps tell the story of why they changed plans on demolishing more of the dorm halls.
Martin and Eaton were opened in 2003 and 2004, then Storm and Knapp were knocked down in 2005. This happened right as enrollment dipped, 2006 being the lowest enrollment this century at 25.4k. What followed was a steady growth with enrollment ballooning to 36.6k in 2016. I would imagine Geoffroy and the administration were targeting enrollment growth and decided to delay demolishing more housing until new dorms were constructed to accommodate the growth. Plus the '08 financial crash probably put a damper on any plans to develop the Towers area further.
Once Leath took over, he was hyper focused on growing the enrollment despite there not being enough housing on campus. Since the peak Geoffroy hall has opened for more housing, and enrollment dropped back to 30.7k last year, so it wouldn't shock me if they explore closing up Towers again in the future. Or finally finish demolishing Helser.