The evidence from the text that best supports the inference that advice to people who want to help bees will continue to change over time is:
"Keeping more bees and planting more flowers may be contributing to the spread of diseases among human-managed and wild bees."
This statement suggests that the current practices recommended to support bee populations (such as keeping more bees and planting more flowers) might actually have unintended consequences, indicating that recommendations could evolve as new information about disease transmission and its effects becomes available.