The top powertrains of the Colorado are reserved for the Trailboss, Z71, and ZR2, and possibly a potential future High Country trim since the LT is the highest non-offroad trim right now. I think it was rumoured the TRD Pro(and maybe a Capstone like the Tundra?) models will be getting a detuned 3.4TT V6? If this is the case, I don't think Toyota will have any issue. If they don't get the 3.4TT V6.. that'll be a bit more concerning.
Regarding the T24, it will have no problem competing with the standard WT/LT trim Colorados with the 237hp/259lb-ft of torque trim level. I'm sure the T24 is going to be re-engineered to be torquier and stronger for the body-on-frame vehicles anyways, and the hybrid models will offer even more torque.