Why vanished most tradition in developed states?
Because most tradition are based on shortsighted goals, false mental models and historic events. Luckily, most traditions aren't about important aspects of life, like medicine and agriculture. Sometimes, they are. And thats then problems starting (or at least aren't going to be solved).
Like in India, where h*** villages lost their living, because traditional agriculture destroyed the soil.
The good thing is, we're in the 21th century, and science is able to repair some of these mistreatments of nature. With the help of Sodic lands reclamation technology, a restructuring of water usage, new financial instruments (micro-credits) and some overlaying organization composed of natives, the problem had been solved.
300 villages in ten districts have successfully reclaimed an area of 22,920 Ha (as against a target of 17,100 Ha) benefiting in the process 68,525 families comprising about 400,000 people. The crop (rice) yields, on earlier barren and unproductive lands, range between 30 and 35 Qtl per hectare.