$20,000 USD for 1 BTC is going to happen within 6 years!
There's no need to go all in on any one coin. By your same argument, you shouldn't be buying DOGE coin either. It's possible that some low marketcap coins right now like THC or DOPE will go from a $5,000 marketcap to a $5,000,000,000 marketcap. Turning your $5,000 into $5,000,000,000.
If you have $5,000 to invest, it would probably be best to invest in some sort of person or company who manages your funds for you. This way you sit back and relax while they research coins and buy into them for you.
This a parody, right? You can't be this naive.
I wouldn't put more than 10% of my total investment funds into any one coin.
With so many amazing cryptocoins, many of them only get like 1% of my total investment funds.