I suppose I worded myself badly, but what I meant was that I do agree that the Fall of Guardia isn't enough to fill a new game, but it is a worthwhile story that could be examined in a sequel. In all honesty, a new ending would need to be quite lengthy to allow us to fully understand what caused the Fall, if you ask me.
Your opinions are justified and warranted, I just happen to disagree with you on some points. I think we all wanna know what happened to Crono and co and perhaps we agree that CC didn't explain it...I just don't think that we can sum up the Fall of Guardia in an ending, an epilogue mobile game or short RPG, however, might do the trick. I think it could be taken care of as a side quest to a new journey, but that's just me.