The civil unrest in Hong Kong is temporary, without long-lasting economic loss. Over the past 20 years, Hong Kong has demonstrated its tremendous ability to overcome social instabilities, as seen during the Asian financial crisis in the late 1990s, the SARS panic in 2003, the Umbrella Movement more recently, etc.
On the long-term negative impact on its status as a financial centre, the primary concerns are China's move to restore order and how far it will go to ensure Hong Kong remains under its influence.
However, turning Hong Kong into a burden is never in the interests of China. In fact, Hong Kong is part of China's economic strategy; it is in China's interests to safeguard Hong Kong's autonomy, especially its economic strengths. Many big Chinese enterprises have listed and set up offices in Hong Kong, and conducted foreign direct investment through Hong Kong.
Indeed, many entrepreneurs from around the world are among the beneficiaries of Hong Kong's open market and independent legal system. Thus, maintaining diplomatic relations with other countries is another concern that will hold back any extreme actions against Hong Kong.
In short, the civil unrest will have a direct impact on retail and tourist businesses in Hong Kong for a short term, but Hong Kong will retain its status as a financial centre with its own ability to resolve social crises, and with China's reluctance to undermine its institutional advantages to protect their own interests.