I am writing a textbook serving a very niche field.
There was one textbook for the subject area, but its fallen out of print 10 years ago, and I think the info is 30 years out-of-date. I found the author was heavily biased, hasn't kept up with the recent research, and the design no longer appeals to the audience of young students aged 10-12. They leave out tons of material I feel is important for the audience to know, and contain entire chapters of details now proven to be false.
I'm writing what I feel could be a solid replacement for that book. It is a completely different, original textbook, but also workbook, lesson plans, activities for teachers, a whole kit basically.
This publisher seems the best one for the field. They are the #1 publisher for the subject area, in fact, 50% of my sources are academic books published by them, and based on the past releases of the competing textbook, they know how to get it out and into every school that teaches the subject as well as deal with the state governments to make the book the official textbook in public schools.
My concern is, is there some problem approaching a publisher with my manuscript, when it essentially is competes with something they stopped publishing? Is it better to instead find some competing publisher?