ahh another veteran returns!
GrayLensman must be right around the corner.
That's an interesting take, and I am pretty sure you're right. Theoretically, there are an infinite possible of outcomes where Lavos was destroyed, and various ways the Day of Lavos came to be. Planets with other humans is likely, but only far into the future of Crono's planet.
Lavos' origin from deep space has always intrigued me.
Did he come to Crono's planet by accident, by choice, or was it told?
Lavos' survival is clear, but let me throw in something more...
Was it planned by the Lavos entity itself, or possibly from a larger hierarchy within Lavos' species?
If so, was Earth detected by long-range sensors before "Lavos" was sent, or was Lavos sent to seek out planets at random?
There are a lot of similarities to Lavos and The Borg from Star Trek.
Anywho, nostalgia and the unexplained fate of CT's team within CC is the major reason. Those who played CT have a "bond" with the original cast. Many of us grew up with them, and they were apart of our childhood when life was less complex and everything was a mystery. The fate of the original team is something everyone wants to know about, even though it is implied they presumably died long ago. How did they die? Where? Are they even dead, or did Dalton seal some of them away somewhere? Where was Magus? What happened to Lucca? Crono and company may have completed their mission, but their fate is unknown, and thus, their stories incomplete. I direct sequel (or remake) of Trigger could tie in key elements to Cross, reintroduce the original cast, give us more facts about Dalton and Porre, and the Fall of Guardia, with Dalton presumably defeating the last wielder of the Masamune and how it became a major plot vessel during the events of El Nido.
Again, most importantly, the fans want any new game with Chrono in the title.
Secondly, they want the original cast. It would be the appropriate thing to do.
I agree it was more about the theme, but the characters play a huge roll with the fans.