Authors will likely complain over what appears to be a more than 50% reduction in their rewards

Numerically speaking, changing the split from 75/25 to 50/50 is a 33% reduction to the author portion and if one factors in the budget redirection to SPS, it is a bit more, but still less than 50%.

To be more specific 75% of 75% is 56% of total inflation going to authors now (ignoring reverse auction, which increases this a bit). 50% of 65% is 32.5% (again ignoring reverse auction). So the net reduction is 42%.

This ignores changes in the economy and behavior and significantly overstates what authors are receiving now. Rewards from votes that the author pays for don't count.