I think the parallel are the occupy protests in HK around 2014. In the beginning they had broad support but after about half a year that public support was gone and the police could clear remaining "occupiers".
As an outsider the issues of extradition seems like a symptom of something deeper: Hong Kong's role as a part of China. Perhaps frustration over economic conditions: Obscene rent to wage ratios. Not the same growth as in nearby mainland.