I feel like this doesn't address that there is in fact already the infrastructure in place to move litecoin into 'acceptability' much more quickly then 2011 bitcoin.
We already have services like coinbase, bitpay, mtgox, etc. that make it fairly straight-forward for merchants to accept bitcoin. That was the hard part. I don't see a reason that any of these services in the future couldn't roll out litecoin support, and instantly put it's acceptability right up there with bitcoin.
I'm not saying it's there yet, but I don't think comparing it to a 2011 bitcoin is a very fair comparison when in fact lots of pieces are in place to make litecoin (or any other coin, for that matter) acceptance a much more simple proposition.
If bitcoin can be inflated by adding litecoin, it can be inflated by adding more currencies, thus the limited supply of bitcoin and all other currencies are destroyed. The result of this would be catastrophic since unlimited supply means value will go to $0. There is no reason to pay for something with unlimited supply. The fact that price is going up indicates that people have confidence that this won't happen and I believe the reason so few have chosen to support litecoin through merchant integration is because it's not in their own interest to do so. I think the only reason litecoiners want to see it integrated anywhere is for a quick buck.
The bitcoin/crypto experiment is still young. Right now is a phase of people jumping into it so everything gets pushed up. But it's fairly well known that a possible downside to the bitcoin experiment is that it is easily copied.