Neil Simon must have fallen out of fashion late 80's/90's because the "big screen" adaptations of his plays were done for the small screen and he even did tv remakes and not for the better. Broadway Bound, London Suite, Jake's Women, Laughter on the 23rd Floor, Odd Couple Remake, Plaza Suite remake, Sunshine Boys remake, Barefoot in the Park remake, The Goodbye Girl remake and Rumors but done for French TV
I thought from the mid 80's onwards his original screenplays were awful: The Marrying Man, The Slugger's Wife, The Lonely Guy, The Odd Couple II (Which I believe is his last original screenplay)