This is one of those ideas that, when it happens, you almost think, "Wow, that should have been figured out a long time ago."
After the "One More Day" storyline, the two sister books to Amazing Spider-Man, Sensational Spider-Man and Friendly Neighborhood Spider-Man, will be ending. In their places? Amazing Spider-Man three times a month.
What a smart move by Marvel. It might very well result in lower Amazing Spider-Man sales, but the increase over Sensational Spider-Man and Friendly Neighborhood Spider-Man will more than make up for it.
The notion of the less-famous books being "less important" is such a significant idea that it is kinda surprising that this solution has not been thought of before. It's essentially no different than what the Superman books did in the early 90s with the triangles, but in this case, there will be only ONE title.
Good thinking, Marvel!