The Tokyo race is not that difficult.
It makes no sense to nerf PP in that race, though. It's a WTC 600. Six hundred. I can enter with a 550PP car if I want, but it's gonna be gimped.
To nerf the Tomahawk without fixing the PP system they need to add a power restriction, in fact would be very effective as cars in the 400 bhp range are very competitive.
I'm all for more events to use the lower cars, though. 550PP has a few, but none that pay as much as the new endurance events, except for the Mission Challenge race, which is a one-time payout.