One difficulty in implementing your system is that on a per unit basis, costs to retrofit vary widely. $10,000 per unit in Marco Polo could be $20,000 or more in a building with less units, or a worse plumbing system. So how much do you take out of the assessments of various projects? Costs and values rarely align and the projects that are cheaper to retrofit would raid the funds first. 

Let's also consider that sales in non-sprinkled buildings appear unaffected so far by this issue. Demand for housing is strong.