Remember that USA is about 5% of the world population, so I wouldn't expect holidays in one country to make too much difference in a global market. China might be a different story as they seem to be the main players.
I can easily see 10% gains in a year (if you smooth out the highs and lows). BTC'ers seem to be tolerant of higher risk than people for example, looking provide a reliable income from their life long savings put into BlueChips or something in their later years, than young guns who can afford a few mistakes when they are in their peak learning years.
For the next 10 years, the price rise will be bigger and volatility be higher. When the market cap reaches 1 trillion, the price will be stable.
No I don't think this will happen at all.
The more people start with investing in bitcoin the lesser the share of the wales.
WIth that in mind they will not be able to pump it anymore.
But for most people, they do not trade. They hold or use it. So the bitcoin number in exchanges is limited, there will be pump and dump, but in smaller scale.