Let's say for instance "Mc Donald's" launch a new Alt coin, called "McCoin" and Billions of people starts to buy and sell these coins. What would the natural spinoff of this be? I think "increased awareness" of Crypto Currencies.
Do you think this is Good or Bad for Bitcoin, when this happens?
I think it will be good for bitcoin even if centralized companies starts to create a cryptocurrency of their own after all, it can only be used to purchase goods and services rendered by the companies who issued a particular cryptocurrency. That's where bitcoin can come in, they can use bitcoin or any good crypto as a medium to pay these services via conversion services that can be accessed easily allowing fast conversion of btc or any decentralized crypto to a particular centralized crypto(in your example's case, it would be McCoin).