Quote from HyzeKamigawa block happened 10.000 years ago, iirc, so yeah, there's room for new stories
Er, no, it did not. The Kamigawa block happens around 3700-3800 A.R., whereas the current events are establishes to be around 4600 A.R. So it is about 800-900 years at best.
On topic - they explicitly said on the PAX panel that they have currently no plans to return to Kamigawa (or Ulgrotha). That seals the deal, I think.