Yes, you're probably right. There are also others video uploading sites but youtube is on the top as always.
It really depends on the person and his circumstances (job, income). Here in our place, all output of common TV channels do wind up in YouTube, so its kind of like I'll just watch TV in YouTube.
Yes, but there are millions of tv sets and not as many internet connections so it's there to stay for while longer i guess.
The only tv channel I watch is on youtube. and most televisions offer us to watch them online so yeah traditional tv is dying. except some old people like my grandma who still watches tv I don't know of anybody who still does.