Nice idea!
And... It is not about being nice to each other or say nice things to each other... Being nice to each other brought us to where we are as humans on this planet.
Its time to start and grow up and to under stand the impact we are having with all we do and not do.
Here is my suggestion to get rid of 'niceness'
Being kind when kindness is needed
Offer affirmation, when affirmation is needed.
Offer challenge when challenge is needed .
Offer tough love when it is needed.
If you say yes, follow through on your yes.
If you say no, follow through on your no.
If you start, better finish.
And so on...