Ah, so it's all magic chance by Lavos, yet somehow, all the way to 1999 A.D. no other Gates were created by science.
There's a reason people in the game outright state that Lavos isn't responsible, and that the planet can and does dream. The Entity's existence is perfectly logical, whereas needing Lavos to create the Gates involves a ton of random chance.
Why does technology have to create a gate between 1000 and 1999? Lucca created one by accident. And the only pure technologically created gate (the Epoch) was made by Belthasar in 2300. The gate to 1999 is there because Lavos appeared there. It's not just random chance that all these gates pop up right where Lavos has interacted. And they don't ever state that Lavos isn't responsible, they are just talking about what they think over a campfire.
If the planet really is doing all this dreaming you're talking about then why doesn't it conjure something up in Chrono Cross to save itself from the Time Devourer? If it wasn't for Belthasar creating his elabortate plan the planet would've been doomed. If what your saying is true then why didn't another set of gates just magically appear to help some group go around and save the planet?
Plus, after Lavos is destroyed the gates magically disappear, but the Epoch still works. If the Epoch was confounded to only work with Entity gates, as you put it, then why would the Epoch still work? hmmm?
Whatever though. Think what you want, but there's NO entity, and the planet doesn't have a consciousness of it's own or anything like that.