I don't really think China plans to permanently ban Bitcoin ... or at least not cryptocurrencies ... I think they are doing 1 or both of 2 things.

1. They banned Bitcoin so the price would drop and they could buy in, or
2. They plan to create and promote their own cryptocurrency on a national level, and they want the Chinese to use the new cryptocurrency.

Eventually, these manipulations will blow over, and the cryptocurrencies you mentioned will resume there projectories.

As far as what re-fuels the buzz or demand for cryptocurrencies goes ...
There are lots of fundamental things that will drive it.

For example, the public at large still hasn't caught onto cryptocurrencies yet. When new investment funds are established for them, that will spur a big demand and probably hit the news. That will boost awareness, and the public will slowly start to engage.

Other drivers will be new capabilities such as the smart contracts feature of Ethereum.

Limited financial options will drive some coins ... for example, limited financing options for marijuana will drive the potcoin.

Sooner or later, Governments, crowdsourcers, companies, etc. will figure out they can use cryptocurrencies to raise money, pay debts (for less national currency), increase sales and return sales, etc.

These are the kinds of thing that will drive crytpocurrencies to new heights.

Anyone out there have specific technological advantages you believe will drive specific cryptocurrencies ... or other events or scenarios you believe will drive them?