User blog comment:Omega natsu2/Anime./@comment-24034641-20140625025441/@comment-4829046-20140702110834

Except SAO was 2-cour and had several times the popularity. And then you have Accel World by the same author, which was also 2-cour and aired before SAO but still has no sign of a sequel series even with the LNs being removed from BakaTsuki as well. So really it depends. You get mediocre series getting a second season in less than an year of the first and similarly you get awesome series like Log Horizon having a second season coming merely months after the first season ended.