It is good news for litecoin. But will be trading volume be big so that Coinbase will earn a lot of fee from it?
Most likely.
Once added, Coinbase would be incentivized to market Litecoin in conjunction with its point of sale system. The combined effect of Coinbase, GoCoin and a well-trusted global LTC market (China in particular) should lead to a cascading chain-reaction of similar adoptions, thus exponentially widening its market power.
More interestingly though is the very-long-term prognosis, which could yield some interesting wildcards. One such example is the concept of antique. As the years turn into decades and the emission rate dwindles, Litecoin may well turn into something of a
collectors coin, which could inject an economic dimension into the situation thus far not considered.