Spicy Indian food is now probably more popular
Just out of curiosity on this I popped on Just Eat for my area (close to a large city centre in the UK). While there are 11 fish & chip shops, there are 28 Chinese restaurants and 55 Indian. For the sake of staying on topic, there are also 12 Kebab shops. While there is no doubt there will be some crossover (some Indian places will sell kebabs, some kebab shops will sell fish & chips) the numbers themselves tell the story that the humble chippy isn't as popular in the UK as it once was.
In saying that, last time I was in Kraków I noticed that a lot of kebab shops had changed to "noodle and rice bars" and it seemed every new fast food place to open was a gourmet burger joint...so maybe the popularity of kebab shops is waning too. That is just from the one most recent trip, and I don't have numbers to back it up, but I would be interested to see if the numbers of kebab places are falling.