Here's another question. When Crono and his party go to 1999 A.D. they fight Lavos and then they kill him the game is over, but if they beat Lavos at 1999 A.D. does that mean that the year 2400 A.d. the world won't be in debris in that year. It will be a regular world. They never show the year 2400 A.D. after Crono and his party beat Lavos.
If you mean that when Crono + Co successfully defeat Lavos at 1999ad. would prevent the ruined 2400ad. then yes.
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I also do not believe that the Entity is the Planet either. I think what the game refers to as the planet, is just natural events. And maybe the Dragon God/God's.
I got the impression that Dinopolis wasn't forcefully pulled back by some Planet-Entity, but just a natural reprecussion due to Lavos pulling back Chronopolis into the past. The "Planet" hates humans, is not the planet itself, but all the other indigenous beings that did not benefit from Lavos's Evolutionary Engineering. The Dragon Gods are Angry for what they are doing to all the other life forms, because the humans really only Consume materials without giving anything back in return.
Now the Entity on the other hand, I think is some uber-time Traveller that somehow tries to influence the time line into his own personal Paradise. Or have the time-line what he "Dreamed" it should be
Maybe an even more advanced Chronopolis was forged in the new merged timeline, and they are trying to fix some mistake...
So many ideas for Chrono Break... Damnit SE, Make it, and make it good!