I lean towards no. That would be no different to answering other questions in the title (albeit most answers won't fit!) Users can still search the rock term of interest in the search bar and find all answers mentioning it, and adding the conclusion to the question no better helps future users answer their own questions, as they still likely need to click each question to see the topic rocks.
Plus many rock questions have multiple suggestions rather than one certain answer.
I do agree with undercurrent sentiment that many of you may well share: that rock identification questions are becoming a bit overwhelming and perhaps tedious. And part of that is definitely in the generic nature of them. I was quite a reasonable proponent for them early on, but wonder if they're starting to perhaps undermine other questions and weary answerers. (I don't know if I'd find such questions more tiring or less tiring if I were experienced enough to answer them.)
But rather than surface changes that improve the look of such questions but don't add any benefit to the user, I instead suggest we start actively editing question titles from "Can somebody identify these rocks" to "What rock is this red, grainy rocks found in New York?" or such. That way the change may actually draw users looking for similar rocks to it. Questions with multiple separate rocks pictured should be closed and split up just as any other question asking distinct multiple questions thereby preventing a concise title are.
I will offer one place where the answer could be useful to be edited into the title. If twenty questions ask "Is this a ?"... then having a summary answer might better guide people towards valid/invalid examples within the question they may want to ask.
Alternatively we could merge such questions into a central "How to determine if my rock is a meteoroid?", with pictures of many user rocks and a detailed checklist of how the determine such, and the limitations on Internet diagnosis. Then close all future questions as duplicates.
It would also be nice if somehow rock identification questions that get closed eventually were removed from the search list and similar questions lists and such. 1000s of unanswerable identification requests due to horrible pictures and incomplete information are of no use to the site, and are akin to if people asked "Why is weather?" regularly - I would hope such questions would eventually disappear if they were out of control.
Here's to hoping we can make some improvements to help keep our community keep being of best use and interest to all!