I simply don't believe other series HD makeovers rely solely on how well TNG sells.
You are really, really incorrect.
So you're telling me this: if TNG sells really, really well but based on those figures DS9 won't turn a profit because of cost, they'd still do DS9?
I worked in a corporate environment for a really long time and things simply don't work that way. Unless you get a totally half-assed DS9.