I'm shocked that The Saturdays have actually lasted as long as they have, if they were on any other label they'd be gone.
They've had four massive opportunities, and each and every time they've messed it up, they don't deserve it anymore. Their first album was decent, but they;ve gotten progressively worse. Wordshaker was an album that didn't flow, it was like a collection of BSides from different artists re-recorded by The Saturdays, and then Headlines was a step in the right direction. It seemed they actually got an identity with Missing You & Higher, but they went for something else with their Notorious, and then reverted back to Chasing Lights era with MHTO.
Their material isn't good enough. They've had decent songs, but nothing that will ever stand the test of time, and they, quite frankly, dont deserve the success theyre even experiencing now.
I think they should do a greatest hits (or a singles collection they should probably name it) and then go. It wont be long before their fans move on anyways.