I guess I'll get people's thoughts here... Several people have voiced their opinions in turning the Kensai Magus guide into a more generalized Magus guide (though, a specific Kensai adaptation would still exist).
How many people are fine with Walter's work, and how many would like to see a more comprehensive work done, with more in-depth coverage of the archetypes (especially the ones no one talks about, the Myrmidarch and Skirnir especially)?
If there's enough interest, I'll start working on it. If not, then well that just means Walter has done an excellent job that has lasted even when outdated!
I would love for you to write a more generalized Magus guide. Walter did a great job but the newer material changes some of the assumptions.