problem is that mango's are not same as wheat or paddy like Punjab that they can be switched for each season...Well the problem here is there isn't demand for those mangoes, ideally farmers need to divest from it and focus on something else. Issue here is gormint is poking it's finger in both supply and demand side.
as ezsasa mentioned ... mangos always see a cycle of low / high yield which is a truth as i myself have a small orchid and it do happen with mangos specifically. To ensure that farmers get decent prices for their product, need of the hour is to setup storage facilities to store during high yield year. this way the price will be fair to everyone next year when yield is low and farmer can sell at their price. Same time farmers will get better price for the over produce of previous year. it is about managing the supply and demand side...
certainly private players will not setup storage facilities until it benefits them.. which leaves farmers or govt. farmers can setup via way of association or pooling resources else we have only govt ...