I honestly doubt it. The Horse Show was and always will be a perfect storm of attracting the internet's artists. It's a show about animals, so it attracts the furry artists. The character designs are interesting without being too complicated, so it attracts the artists with a good eye for design as well as the artists who are lazy. The mane six's personalities are striking and draw people in, so it attracts artists who easily acquire waifus, and also attracts waifufags with money who will commission high-quality art from high-quality artists.
It really has been one of a kind, as far as getting good art and porn goes. I doubt DCSHG will replicate the Horse Show's success on that front. We'll get some of the artists, but we won't get all of them.