Nobody commenting about bleed air sensors? I think that bleed air sensors are the obvious solution here, expensive and difficult to add but with the claimed alm

Nobody commenting about bleed air sensors? I think that bleed air sensors are the obvious solution here, expensive and difficult to add but with the claimed almost 2000 fume incidents per day it seems like they are fairly low-hanging fruit. Anyone with more experience know about this? e.x. how expensive they would be to add? There's this screenshot from a presentation about bleed air sensors (from the article) http://avherald.com/img/spirit_a319_n519nk_boston_150717_3.jpg http://avherald.com/img/spirit_a319_n519nk_boston_150717_3.j... I suppose in this case the "sensors" worked but there was interference from higher-ups: "While the flight crew was considering what to do next, the assistant chief pilot of the airline boarded the aircraft and told the crew off, that they didn't know what they were doing and they were wrong in pushing for further maintenance action."