Just to put this out there, critical reviews and word of mouth semed to kill SPECTRE at the US box office. It was a Bond movie for crying out loud, one of the biggest and longest running franchises out there. The same happened with Terminator Genysis. Both long running, profitable franchises, which each put out one shit film and nobody in the US watched them.
It seems the US movie public either has some level of franchise fatigue or zero tolerance for crap tentpole movies.
The majority of Star Trek fans, both hardcore and fair weather, are already hating on Beyond like hating's going out of fashion. Unless that view is changed PDQ, the film, following on from Into Darkness which many fans didn't like either, is dead in the water. If the US don't watch it, overseas box office won't save it.
SPECTRE hasn't even taken $200m in the US after 6 weeks, compared to Skyfall's final US gross of $304m. The consequences, if it were to happen, of Beyond suffering that same kind of drop off, when Into Darkness only took $228m, will probably lead to no more Trek films.