I don't think Bitcoin will ever be dead. I doubt it. It's the first crypto currency ever created in history that started the with the Blockchain technology. But I do know this....once Bitcoin becomes mainstream, it's value will probably rise up to $1000 or more. That's why I'm holding Bitcoin since it's the most valuable crypto right now. Most other coins are just another copy of the Bitcoin code (like Litecoin, Dogecoin, etc) However, I have to admit that most coins have bought promising technologies such as Monero (XMR) which is by far one of my most favorites. Just opining 
1,bitcoin it's already mainstream2,monero is shit
1. Well I was talking about global acceptance (everybody would use it)
2. Could you explain why Monero is shit?
Bitcoin is definitely not mainstream, mainstream could be something which is used/accessed by atleast 1/10th of the world. That is why hollywood is claimed to be mainstream, because thousands of people watch hollywood movies everyday, buy such movies. Same goes for musicians, etc. I don't think bitcoin is at that level. There are 2-3million bitcoin owners in this world, and only 200-300k active users of btc
Monero? Just another crypto-currency. Since it is not based on Bitcoin, Monero cannot take advantage of the Bitcoin technological ecosystem, like GUI wallet or payment processors.