It's maintained a strong popularity throughout the years, and of course the release of the new version ups the interest. There may be a fear it will lose its revenue-generating ability after the remake comes out , so there's a scramble to make money off it through as many venues as possible (though I'd prefer if they finally remastered the Overture section on the Blu Ray and tried to squeeze out pennies by releasing yet another edition--I'd shell out.)
But I am not at all sure the remake will replace the original in anyone's hearts. "We have more than one real Latino this time!" just isn't going to be enough of a selling point, even in these intensely P.C. times. And without Robbins supervising the choreography, and with Spielberg having essentially no experience with musicals, there's no guarantee this movie will have an impact similar to the original. (Robert Wise had no prior experience with musicals, either, but he was a real chameleon as a director: there wasn't a genre he didn't make a hit movie in, apart from straight-up comedy or romance. Horror, sci-fi, noir, drama, social message, musicals, he seemed to switch genres effortlessly. Spielberg mostly makes movies where CGI things go boom.)