The ideology is still there, among the elders.......it won't die out easily because of the fact that they witnessed persecution at the hands of Congressi thugs when they were young and turned towards Marxism permanently........
But they lost power mainly due to the change of mind of the younger generation who witnessed practically no development for the past 35 years under the Left-Front govt........but somehow Bengalis stayed out of Hindutva ideology.....hence BJP never got foot-hold in Bengal.........
We don't want foreigners to be blackfaced during valentines day, couples beaten up in parks, people beaten up in pubs just in the name of 'preserving Hindu values'(whetever that means).......that doesn't mean we don't care about Hinduism, famous Hindu spiritual leaders like Ramakrishna Paramhansha, Swami Vivekananda atc. were all from Bengal........we just don't like people teaching us Hinduism when they themselves know nothing.....Bengalis simply don't like to be bossed around....
Therefore, If BJP cannot shrug off the Hindutva attitude by alienating itself from organisations like Siv Sena, Bajrang Dal etc., I think there is no chance of BJP making any progress here....
But yes, we(atleast I) support BJP govt. at the center after seeing how corrupt congressis ruining our country....and how Narendra Modi developed Gujarat......we support Modi's BJP.