My initial thought is simple, but gCaptain probably wants me to respond with more than "$$$."
FLIR is amazing, would be quite useful, but it would take persuading many people from many countries of concrete benefits to offset the costs related to equipment, maintenance, standards of use, and training. And to persuade them that a particular type incident that occurs with high frequency and has severe consequences can be avoided by using FLIR alone instead of what is currently mandated or available. Then, after years of prolonged discussion at the IMO level you might get things going so that member states would begin to implement things. It certainly would not get to the level of OSV's first, that's for sure.
I like the use of infrared tools currently available for firefighting. Those tools certainly help the on scene commander.