I used to make manga-style graphic novels but eventually stopped when I realized making one without an assistant and keeping up with tight deadlines don't mix. Then I switched to writing light novels.
That said, while I believe in making use of what medium is available to you, I don't think of dropping something you like just for the popularity is good. For one, it may lead to eventual burnout and loss of interest on your part. Second, in a sea of many similar works, how do you suppose to stand out? Third, drawing and writing are just two components often mixed for better storytelling. While it is certainly popular, manga-/anime-style drawings are only secondary to many avid readers because what they look for is a story that is engaging to their likes.
The examples you used are a few evidences of what I'm saying.
There's also this one time in my country where an old comics guy (look for Carlo J. Caparas) decided to revive the traditional comic style. In an era where manga and anime drawings are popular, his efforts surely generated a buzz.
However, it ultimately failed because people didn't like the stories he wrote, instead of disliking the drawing style.
Finally, I am an illustrator that uses a combination of digital and traditional drawing techniques. Traditional from pencil to inking, and then digital for coloring. My main reason is that my hands are shaky when I use tablets (when drawing a straight line), and also, the Philippines has one of the ridiculously high electricity rates in Southeast Asia, so I can't afford to have a continuously open PC. n