Because none of the credentials of any of the editors on eNotes have been credibly verified, technically speaking, no, nothing on this website could be sourced as a scholarly source. eNotes is as much a "source" as wikipedia is, and I would personally dock marks to any student that tried to source wikipedia. Though many on here do indeed have heavy educational backgrounds, there is no way to verify where the information is indeed coming from.
It is very easy for me to tell you I have a B.Eng in Aerospace Engineering, and am in the process of doing a PhD in Cognitive Neuroscience, but all you have are my words, and in the scholastic field, that isn't enough.
The best scholarly sources are peer reviewed journals and research papers, not Internet forums.
Were eNotes to verify the editors credentials from the academic institutions themselves, that would be a completely different situation. Also, were an editor to provide links in their profile to their actual publications, then a student could source the publications themselves - but not an Internet forum.
But, that is all technically speaking. Whether or not you could cite eNotes in your bibliography is not related to whether or not you can trust the information given here. While it is inappropriate to source an answer given here in an academic work, that isn't to say the answers given here aren't credible. I believe that they are, and that eNotes is a very valuable source of information for students who are looking for some help, and teachers who are looking for some other ideas they may not have come up with themselves for classes.