Bitcoin is at $11000+, I do not stress anymore haha 
Not sure where you read 11k + . Its already 12500+ and in the bull market this is rising so be ready to make money if you had invested or willing to invest some of your money in the future term . This would be a great thing as you would make a great gains in coming time . Ensure you diversify the risk and not just invest in 1 coins.
If someone is inclined to invest in other than Bitcoin crypto, then you are right, it's better to diversify their investments. But I wouldn't advise to people who are going to invest solely in Bitcoin to consider investing in other cryptocurrencies. Normally by diversifying investors lower their risks, but investing in other than BTC crypto is much more risky than investing in BTC only, so I can see no point of doing that.