I'm in agreement with CudaMan that the Corolla GR was the correct move for the US market. Toyota isn't bothering with a US spec car in that class anymore, after all. The choice wasn't between a US market Yaris GR and this Corolla GR. The choice was, and is, Corolla GR hot hatch or no Toyota hot hatch.
The Corolla hatchback has even less interior room and cargo space than my MK 7.5 GTI, which itself has less cargo space than my 1st gen Mazdaspeed3.
Should my GTI meet an untimely end (I tend to keep cars a long time), I'll consider a Corolla GR if it's not priced like the Golf R.