I don't think that much of what you have written are actually the facts on the ground.
Manekshaw never ever thought of a coup against Mrs Gandhi. Please read what he writes. In fact, he overreaches himself in praising Mrs Gandhi.
It is correct to soem extent that the "material" that is joining the Army is not the same as before. The reasons could be that life is much harder and combat is all prevasive. The day you join you are in counter insurgency and that is no fun!
Look at the best paid, best fed and best comfort ARmy int he world - the US Army. They require green card soldiers!
We all want glory for our country (just see our cyber warriors on this forum).But, we also want the safe and airconditioned havens of our homes or fancy high paid jobs in civil.
One cannot look at the Army career in such asimplistic black and white environment.