This is the classic problem in India. The most typical excuse for an Indian fan. The moment the team begins to lose, the captain and most of all the coach is sleighed. I'm sorry, but the problems runs much deeper in regard to test cricket. I'll give you as honest an opinion as I can and as close to the truth as possible, without any bias.
First of all, India is a limited overs country. Our board's endless lust for money means that the national team is practically playing round the year and majority of it is limited overs cricket. If anyone on this board truly believes that India isn't the best limited overs team in any given conditions then they're lunatics. We've proven this around the globe and it's simply not appreciated enough. Look at England, they're almost always playing test cricket and they're still awful. How many majors have they won since the limited overs version began?
I agree with a lot of the points you have made, but India is not a limited overs country. The fans love test cricket, as much as ODIs. If anything T20 is still the most irrelevant of the three formats. I also don't think India are the best ODI team in any conditions. Sure we are generally much better as an ODI side, than a test side, but defeats in the ODI series in SA, NZ, kinda disagree with that. Yes, I do agree though as an ODI side we can compete anywhere in the world, unlike test cricket.
I agree Dhoni is not central to this crisis, but I do think the coach is. He is responsible for a lot of things that he is not helping. Kohli and Pujara got out to identical dismissal so many times and so little changed between the 1st and the 5th tests tht you do have to wonder if the coach was doing anything. Similarly the reading of the pitch in the 4th test was so atrociously wrong that it defies logic. That Cook would have also batter first after batting is hardly any consolation. Fletcher should have read that pitch right. Its well and good to talk about application, but on that pitch batting first is a poor decision.
Fletcher I am afraid has been rather ineffective.