Their lease with Qualcomm is up soon and the city may demolish the stadium after. That and their discussions to partner in the new soccer stadium (to be able to double as a football venue) appear to be falling through.
http://www.sandiegouniontribune.com/business/growth-development/sd-fi-sdsusoccer-20170516-story.html
http://www.sandiegouniontribune.com/business/growth-development/sd-fi-sdsusoccer-20170516-story.html