The marked cap for BTC have increased from 60 to nearly 120b$ since september. In the meantime, the total market cap (BTC excluded) is somehow stable, only 10b$ have gone out of altcoins in the same period.
Where do you think the money that goes into BTC comes from? Margin trading? New money?
Do you know something by fact and a link that can support it
One of drivers for BTC is raising of number and popularity of ICOs. The invest lots of money for advertising - and involve new people in crypto economy. Newcomers need btc to invest in ICOs. In other hand, people who have btc don't sell them much.
I do not agree with your statement about "raising Bitcoin because of the popularity of ICOs". A new person knows cryptocurrency is mostly still confused about Bitcoin, how can they understand the ICOs project?