In my opinion, the inflation rate alone is meaningless.
Moreover, by definition, if we keep all variables static, it will reduce the unit value of the token.
Inflation does make sense when it is used to generate value to the protocol and the token.
So to my way of thinking the proper question is
what do you do with the money that inflation generates?
If it is given away, it will reduce the value of the token.
But if it’s used to generate value contribution to the token, that’s fine with me.
That’s why a Dapps Staking mechanism, it should bring value.
So the question is,
what is the inflation rate that generates sufficient value?
I think for this there is no historical data, and history is just being written.
And when there is no data, expert judgment is used.
Without an expert, I would try a gradual reduction of 0.5% per month for six months,
with monitoring of token economics and activity on an ongoing basis.