Here is 1 good reason why Litecoin is needed. Bitcoin already admits it is not a preferential coin for small transactions. If Bitcoin ever did become the million dollar coin everyone would like it to become, your morning coffee purchase would not be able to transferred due to it being dust. LOL at people who figure Bitcoins can be down to the satoshi level. If/when the bitcoin network gets even busier, they will have to knock the dust down to an even larger factor.
Another reason Litecoin might be hyped is because it's not Bitcoin. That can be a huge bonus right now while the US Gov't seems to have the Bitcoin network as it's main target.
If Bitcoin was worth a $1M then the dust threshold would be 1 satoshi (or roughly 1 US cent). The dust threshold is a function of the min fee miners accept. If miners are willing to accept transactions paying a 2 satoshi fee or less then the dust threshold would be 1 satoshi.
The min fee for low priority transactions is actually higher (in terms of purchasing power) on LTC network.
BTC min fee 0.00001 BTC = ~$0.01 USD
LTC min fee 0.1 LTC = ~$0.26 USD
Actually you're behind a bit. LTC min fee dropped a week or so ago to 0.02 LTC still not as low as Bitcoin, but a notable difference from 0.1 LTC.
I think the fee has been lowered already