Is $50,000 reachable? Harder but not impossible! (>10 years)
I would like to sleep today and wake up after 10 years and hope to see this price 
Some well known gigs have also predicted even $1 million is possible per bitcoin within next 10-20 years.
From all the coins out there if one will succeed will be BTC. Ethereum is nice yeah but let's not forget that's not a coin.