The most often referenced number is 1%, and I do not consider that to be a token amount, it is a 10% reduction when the starting total is only 10%. In fact I have long term concerns about the sustainability of witness funding given the declining inflation schedule, so I do think that cutting it even further is dangerous.

But really the main reasons I don't think it should be done are:

1. It confuses two different things: a) core blockchain maintenance, which is an essential function to keep the blockchain working at all, and b) investor funds which are spent (via inflation) to try to promote Steem, grow Steem, and generally make Steem successful, which is the underlying purpose of paying content rewards (it isn't simply out of charity or entitlement).
2. The purpose of the reallocation is not punitive or even any sort of sacrifice. There is no sense in which "sharing the burden" or "fairness" rightly applies here. It is a decision to spend some of the ongoing budget differently and hopefully accomplishing more going forward, including for the benefit of content creators.