That would only work (well) if they removed crossovers and events from these seasons. And had an idea of what the market could and should support as far as the number of titles.
That said, from everything I have heard any other writer talk about, that is more or less how it works anyway; Marvel usually tells writers they have 6-12 issues. Obviously each case may have different factors, such as being tied in to a big crossover before the book event got moving, getting delayed constantly, and having to hit another crossover. But that's Marvel.