Now I KNOW I am not the first to do this, but here is my take on where there is plenty of room for a 3rd mainline Chrono game. Many would wonder what left there could be to do after Cross. Trigger covered saving the future, Cross covered the consequences of messing with time, and healing the scars of time as a whole. So what could be left?
The events on the Zenan mainland that take place alongside of Cross of course! Think about it, Dalton is still sitting pretty in Porre after their invasion of Guardia. However Crono and Marle are still alive, and there is no way the prince and princess are just going to stand by and let him be. But wait...didn't they die?
Well no, not exactly. You see memories of them as children in Cross, which are only present in Home World (an alternate timeline). These are not ghosts, but echos of a time that no longer exists. Illusions if you will. Furthermore judging by Kid's age and the letter left by Lucca, it implies that someone is coming for her and her friends (Dalton). The fall of Guardia happened in 1005 AD, a time when Kid was a baby. However in the letter, Lucca talks to Kid as if she were older at the time she wrote it. This implies that Crono and Marle are still alive, and the fall of Guardia was more a way to get the Masamune in Porre's hands, which is how Lynx got the sword to El Nido after infiltrating and rising through the ranks. However, since Lynx did not exist in 1005 AD, someone else had to lead the attack. As shown by the DS release of CT, this was Dalton.
Now we have Dalton, someone versed in time travel and Dimensional Distortion, and a living Crono and Marle. It is important to note that there will only be references to the events of Cross happening at the same time, but the story will not interfere with Cross directly. This is because in Another World (the true timeline), FATE is very careful not to allow anyone from El Nido influence the events on the Zenan Continent, as to avoid changing the past and prevent the FATE computer system from ever being created at all. There is another approach to this however, that will bring us to our next topic...Lucca.
Lucca has always been assumed to be dead, but we do not know this for certain either. The only death to the original cast that is confirmed is Robo (Prometheus circuit). During the campfire scene with Kid, it is stated that Lucca was specifically kidnapped, not killed. It is also revealed later that Lucca was kidnapped to program around the Prometheus Circuit, to allow FATE to access the Frozen Flame again. However, things did not go as planned. There is no confirmation of her death however. Perhaps what went wrong with FATE's plan was the fact that Prometheus sort of had a bond with Lucca, and he could have helped her to escape. It is also possible that FATE couldn't kill Lucca, as she was a big deal in the science community on Zenan. When things did not pan out, she may have been released as well since killing her would influence history itself. There is also a possibility that her mind was wiped, since FATE could still do that in Another World as well.
The last possibility is that after the events of CC, the Chrono Cross heals the scars of time. Schala is free and there is no time crash for FATE to appear from. This also means that there is no Lynx, which means Lucca was never kidnapped. Guardia would still have fallen however, as that was Dalton to begin with.
So what we are left with is a living Crono, Lucca, and Marle. Dalton is backed by a massive Porre Military and is fighting against a resistance led by our heros in an effort to rebuild Guardia back to its former glory. Eventually time travel or Dimensional Distortions would come into play (again Dalton is versed in both) and he would either serve as the primary antagonist or a starting point till an even bigger threat reveals itself. And that, is where we will end this story for now. This is only a topic of how a new Chrono game could take place after all, and not a full blown fanfic.
So what do you think? Would this be a good starting point for a potential "Chrono Break"? What would you change, if anything? And where do you see the story going from here?