This should be tried before anything else.
EDIT: Your later comment about how it is unfair to existing stakeholders is absolutely true. I was explicitly told by a key founder that a reason to power up and stay in the system instead of dumping the coins I mined was that I would receive 50% (not '25%', or more accurately 12%, as is currently the case) curation rewards and they would be very superlinear (which was subsequently reduced, but still somewhat superlinear). I was also likewise advised to combine my stake into a single account because that would receive even higher rewards by doing so (which no longer is the case)
Now the fact that all of these have been reneged upon and my property has been damaged, repeatedly, by rule changes, does indeed reduce my enthusiasm for the system and for sticking with it. Flattening the rewards would further do so. However, there does seem to be wide support for trying it. If it makes the platform more successful maybe that would be worth it. I'm open to trying it, but other large stakeholders may not be, and I wouldn't criticize them if that is the case.