Not _as_ popular but still popular. She has a strong niche and character design
Also in regards to her current popularity it's more that she's become a central setpiece in the same way Ponyville or the Everfree is as opposed to the actual character which makes me upset. You can tell the youth have taken to Fluttershy (again) and in the wild I usually see Pinkies and Dashies. And apparently Rarity is very popular too, but she's still Top 3 in my heart, and she has her face on things like 15.ai and since Internet = Nerd she gets a leg up in that regard too.
Semi-notably if you isolate just the Real Twi's (Unicorn Twi's) of Derpibooru there's less of her than Applejack which also makes me upset.