Honestly I think that it's awesome. I don't think bitcoin will take off in america. To me the place it will become mainstream is somewhere like indonesia. Time will tell though and can't wait to see the full extent of what bitcoin can do across the world.
Yes developing and 3rd world countries will be the places where Bitcoin will really take off first.
The developed countries however are the ones who mostly build the infrastructure (exchanges, wallets, merchants, markets, most fo the startups).
Latin and South America, South east Asia, parts of Eastern Europe are the places where Bitcoin will be adopted in a bigger scale first imo in terms of daily usage.
Regarding the financial, speculative aspect of Bitcoin it will be USA, China,UK, the developed countries in general to adopt Bitcoin first.