While I hope this does work out because it could reignite some of the spark Hong Kong has lost. However, it's not the first time I see a regulator asking local banks to support some locally regulated sector (crypto, financial services, gambling). It rarely makes much of a difference, aside from some symbolic onboarding of top-tier operators. The banks still retain their legal right to refuse any client if they don't fit the bank's onboarding criteria. The vast majority will continue to be declined.
The regulator's effective influence is limited to domestic matters, which just means local customers and , most importantly , local currency.︀ The banks don't want to expose their correspondent accounts, currency/payment network connections, or other licenses︁ just to appease a regulator somewhere. As long as these banks also transact in USD,︂ CNY, EUR, CHF, JPY, and other major international currencies, they can't only follow the wishes︃ of one regulator beyond easing access to, in this case, HKD.
However, access to HKD︄ wouldn't be something to scoff at. It's a freely exchangeable currency with quite a lot︅ of demand, making it easy to buy and sell.