I think bitcoin will cost more than$ 50,000 in 10 years. Also, it will no longer be the first cryptocurrency for capitalization. Ethereum will take its place because Ethereum has a working economic model. It's not just" digital gold " like bitcoin.
Well people has their own opinions for future prediction but i won't agree fpr that ethereum will take places for btc. To think bitcoin has roll for how many years from 2009 until now. Maybe ethereum would be like that someday but taking replace would be insane. To think ethereun once run by the way of bitcoin then how would it be? That bitcoin now adays also searching for better and more progress.
In future maybe bitcoin will have a greater value among others. And as usual alt would be the second.