Its probably the Farage connotations, its been said, now he has helped to get us this referendum the best thing he can do is step well back from the whole thing 
It takes two individuals - a president and a prime minister - Reagan and Thatcher, Blair and Bush ... and the special relationship will be back on, or off as the case may be. Cameron and Obama don't have quite the same chemistry but that can and probably will change in a heartbeat
I agree, and generally US is very inward looking. I wouldn't act on what they say they will or will not do.
Forgive me, but are we not the 5th wealthiest nation/economy in the world?
I think it will be shakey for a while but look at HSBC for instance, when the chips are down, do they want their HQ in risky China/HK with riots etc, and strange way of controlling economy or do they want, a UK which may vote to leave the EU. They chose the UK.
I think it will be a massive boost to this country to leave.