I just don't understand, personally, why any of this would affect box office potential of the remaining movies?!?
Because, as @M.A.C.O. already pointed out, the things that happen in them will go absolutely nowhere, meaning that it ultimately doesn't matter if people end up enjoying them.
Also, @valkyrie013 is right to point out that people stop watching things if/when they know/find out that there won't be any reward or payoff for them investing their time in the thing they'd been watching.