No sane person would argue about the greatness of Subash Bose or Satyajit Ray. However, they are all history (India was once the richest economy in the world) but once can not rest on past laurels.
In the past few decades, WB has gone from bad to worse. While Bengalis rest their lazy butts on their glorious past, most of remaining India went fast forward.
WB remains mired in decades of inefficient commie culture and crazy politicians like Mamatha (and atleast one foul mouthed, whining CA).
As for movies made in other states, I suggest you update your records. While Pather Panchali may have held its sway 40 years ago, other states too have made excellent movies which can hold their own weight.