I wouldn't have given the article much attention except for the fact it's from the pro-Beijing South China Morning Post. An opinion piece instead of an editorial so not the paper's offiical line but interesting that the editor allowed it to be published at all.
Anyway, just one person's view. I'm sure the forum is confident Hong Kong will remain one of China's premier cities for the next 30 years and beyond.
Wuhan and Hangzhou have far more illustrious histories than HK. Rather than disdaining the prospect of joining "the likes of Wuhan and Hangzhou", the author should realize it would be a honor if HK eventually finds its place there. But obviously he has zero respect for Chinese history and culture.
Anyway, Shenzhen will overtake Hong Kong in nominal GDP per capita this decade. Beijing and Shanghai will follow.