Although banks are expected to redesign WMPs and set up asset management units to compete, fund distributor Puyi Wealth Management said there was "a huge question mark" over whether banks could persuade investors not to shift to more mature mutual fund products.
The sweeping new guidelines, covering all financial institutions including banks, brokerages, insurers, fund houses and trust companies, are the latest effort to rein in China's rampantly growing shadow banking sector, notorious for excessive leverage, Byzantine structures, and opaqueness.
A transition period will last until June 30, 2019, to give institutions breathing space.
The ban on principal guarantees has been singled out by the state news agency, Xinhua, as the most significant step against "financial chaos". In an editorial it likened the guarantees to landmines in the financial system.