Seems rather obvious, you are advocating the pro-choice position and pointing out the negative aspects of using force.  Almost 30 years ago there was a proposal in Denver to force all buildings to be upgraded to the current building code.  Many older buildings would have to be torn down or gutted, as well as having rents increased exponentially, to pay for the mandate.  Those of us concerned about the homeless had a fit, and I do believe it was defeated.
I think the green roof idea is a good one with very positive aspects.  Using force to require retrofit, or simply using force at all to mandate an otherwise great idea, completely wrecks the positive aspects and causes many to seek to avoid it when they could have been persuaded, without force, to do what is desired.  Good ideas should never require force to be adopted.