Turbine blade cooling technology development

Tom's $2B (1990s, now ~$6B) fuel savings for a 50°F operating temperature increase. Gas at 3,000°F running over a 2,400°F-melting-point alloy, kept solid by compressor-bled cooling air. Includes the historical attribution to Professor Schenck at MIT and Nick Grant, who developed the underlying alloy technology at Pratt Whitney in the 1960s–70s.

You have to understand this is an old figure from the 1990s, and you can probably double it or triple it, but a 50 degree Fahrenheit increase in operating — and you know the efficiency of even genuine thermodynamics, you worry about delta T over T — back in the 90s that was two billion dollars in fuel savings for the airlines. Fuel was a lot cheaper then; it's probably six billion dollars to get a 50 degree temperature increase. What have they done to do that today?