I think with the inflation of BTC a 100 btc is a must you need to earn that much to have your life free of financial problems, but supposedly a 10 btc is great though because BTC is getting higher and higher overtime.
I think it's a very small target? I think you have to think that the price will be below average or the price will not skyrocket. so you would think to get more bitcoin? 10 BTC in the 20 years to come? lol I'm sure you could spend 10 BTC in one day for paying the cost of living in the 20 years to come