Groundswell

1. an increase in a particular opinion among a large section of the population.

2. a large or extensive swell in the sea.

e.g. 1. "a groundswell of opposition developed"
e.g. 2. "A gentle groundswell was building over the reef and washing well up the rock."

Disenchantment

noun
a feeling of disappointment about someone or something you previously respected or admired; disillusionment.

"their growing disenchantment with the leadership"