I could understand that for the code/theme side of things, but they still seem like the best site for things like source graphic templates, logos, after effects/premiere pro video files, etc. I feel like that's going to suffer the most from this acquisition. That's what I use for my side projects.
The list you mentioned is what I see being eroded by Canva.
Right now, they have all of those items natively integrated into their online editor, making it stupidly easy for even someone as graphically challenged as me to get decent output.