True that as technology becomes better say a fixed number of planes can be effective occupying a bigger space
or, for a big space, a far lesser nos of plane can be effective.
In future the game would be more of Stealth and detecting the stealth. If Stealth is detected then there would be BVR, but if the Stealth is not detected, only visually is possible then we get into WW1 and WW2 type of Dog fights. And even then the missiles may not be effective, maybe we will end up having guided A2A missiles (like Maverick are for A2G) where the WSO will have the task of chasing the target and to take it down.
Ultimately if the avionics may not be able to detect each other that would also be true that the missiles may not be able to track and then in such situation, maybe we have to rely on our eyes or TV guided versions.
The weight class argument is stupid for a reason, If tomorrow we have an Su-30 MKI flying over pakistan. The options with PAF will be either to keep quiet and know they are outclassed and ignore it and which in a way will have morale boost to india as surgical strike,. or to send the "smaller" F-16 and JF-17 to try and shoot the Su-30 MKI. I am sure I would not hear the PAF saying ".. oh its Su-30 MKI, its heavy plane, Sorry IAF we dont have a heavy plane to go against you, why not send a medium weight class, so that we can send a medium weight to confront it.
Another recent example is that one Russian Su-24 was which is heavy strike craft, and it was not a dog fight.It is never about weight, but the role and the weapons the plane is armed with. For example, if the Su-30 has only left with Short range missiles, then even JF-17 armed with longer range missiles will be at advantage and in this situation, Su-30 might want to dogfight to be able to use its short range missiles, but the JF-17 would have advantage in terms of longer range missiles. in this situation either the Su-30 MKI has to either try to leave the point at top speed or try to get closer to get the advantage of missiles.
MiG-21 uses Tumansky engines and those are no longer produced.
Further Mig-21 was built for speed and not really to be manueverable, Tejas has a lot of advantages over MiG-21. and also on Mirage 2000, thus I would prefer Tejas over both these planes.
IAF top brass will ultimately have a leader who will have vision and see the benefit of using one platform for different roles. Thus Jaguar role might be distributed between say FGFA and Su-30 MKI.
Jaguars advantage of flying low was in era when Radar became all too powerful and the A2G missiles were not reliable and had short range, But with Missiles having 300 Kms Stand off range, Why not just fly HI and strike from Hi, I mean flying from india to general direction of pakistan will not give PAF the idea of the intended target,
So In my view AMCA will be the one to replace Mirage 2000, Jaguars and even MiG-29.
FGFA will compliment Su-30 MKI and replace the older Su-30 MK and only this way, we can ensure that we use Su-30 MKI with optimum life.
lol..why they even comes close for Dogfight, aren't they try to launch the BVR first...in future the air combat occurs in large space, don't expect dogfights.
But yes, If Different weight class meet in a dog fight in rare scenario, ye the light one will rules it ..if its 1vs1 combat
why not HAL can produce more MiG 21 to replace older MiG 21
Well, I agree on this ....mostly this going to be happen.
Our Deep Strike plane was Jaguar, Not the Multi-role upgraded MiG 29 UPG's.
well here in DFI it was proved several times that Jaguar will be replaced by AMCA, not MiG 29