In anticipation of a situation where a quo warranto proceeding may be an option for me, I noticed that the Civil Practice & Remedies Code says a county or district attorney "may" initiate a quo warranto proceeding to remove an official. I'm curious as to what your opinions might be on why one would not choose to initiate a proceeding if the elected official was not qualified to hold the office?

Interesting question. From my own perspective, if an elected official is not qualified under law, I'm inclined to file. The discretionary component would be most pertinent, I suppose, when the factual issue of qualification was a very close one or there were extraordinary (and correctable) extenuating circumstances.