I think sentai goes a little too far beyond the threshold most American's suspension of disbelief is willing to go.
I fully agree with this. We have people asking why build robots to fight monsters in a Pacific Rim thread or why would one have a light-hilt lightsaber. Japanse Tokusatsu also favors style a lot more than US superheroes.
I don't think a hollywood Kamen Rider movie has a place today. Power Rangers has nostalgia factor and renewing old properties has been done since the last few years. Kamen Rider had no such nostalgia ties, and with the barrage of Marvel and DC's superheroes movies I don't think it would do well at all.
But enough being negative! Cars! Trains! Ninjas! Wolves!