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What's a typical rotary EGT? I'm thinking all the titanium alloys I'm familiar with would not stand up to rotary combustion chamber temperatures and gases for very long. Titanium is poor in high-temperature oxidation and corrosion. Almost all modern-day turbine components (at least in the industry I work) are nickel-based. Inconels, Hastelloy, Waspalloy and other materials I can't name.
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That I would agree with that on a modern-day turbine components but you also have to remember that modern-day turbines are cooled only by extra air being forced through the insides of the blades so the actual metal temp on a modern-day turbine components is a lot higher than the actual metal temp of a rotor witch is cooled on each rotor face by an intake charge of air and fuel and the internal side of the rotor has engine oil cooling it there by making the rotor more like a piston than a turbine component ( the turbine components never see a cool down cycle once its up and running )
std egt for a race rotary are around 1600 to 2000 deg F
piston race engine 1400 to 1700 deg F pending on tune and application
there are coatings that can be aplyied to the rotor for high-temperature oxidation and corrosion if that would be a problem