Careful What you ask for !
It is all well and good to have a "Bill of rights" but there are also some reality checks needed here.
If New York gets hit hard with weather and you have decided to taxi you have giveen up your gate. As planes land and stay on gates, the gates become occupied for the duration of the storm. While this sounds rather obvious the difficult part is that the situation does not get this bad very often. So if you force a bill of rights on airlines they will cancel alot more often rather than take a chance of getting trapped in the grid lock.
So it is up to the pax do they want airlines to give up earlier and maybe wait in the terminal for a few days ? Or would they like airlines to try and launch and get the majority of flights airborne and the pax to where they want to go ?