OK.... lets set the stage properly..
P-40 was a fighter, not a close air to ground support aircraft.. Oh, it could do this role, but was not designed for it...
The A-10 is no longer in production, tooling has been destroyed, engineers retired or reassigned. The A-10 is a spectacular aircraft, albeit expensive and a gas hog...because of this it’s loiter time over target is limited..it still requires a rather lengthy runway to take off and land...this means that it is not exactly a forward base aircraft.. if you shoot one down, it cannot be replaced at any cost..
The super tucano fulfills a role for the ground pounders.. it is no good for any other purpose.. it requires a short runway ( dirt or gravel is just fine, as it does not have a massive intake to suck this crap up ) it has multiple hardpoints and 50mm machine gun or 20mm cannon, excellent loiter capability and is real cheap per copy... for the price of 1 A-20 ( when it was available ) you got 15 tucano’s... deploy 15 of these bad boys on a forward dirt runway, and the ground pounders got NOTHING to fear....
The turboprop is serving in many roles today. It does not make sense to drop a proven, viable, needed platform because it is not a jet....
So dust off the plans and correct the obvious defects/deficiencies. Produce a few. Test them, then produce on a large scale. Save a few billion dollars. Educate the young engineers. Relieve the tax burden on the taxpayers. Sell the aircraft overseas to friends and allies who want it.