My hope is, of course, that 21BTC will be much more in the future. Would be nice to have more but to be reasonable that's a fair amount right now.
Going slowly there.
you need 100BItcoin

you can do anything with 100btc in future
Bitcoin price will be stable at $1000

In 20 years, the price of bitcoin will be stable around $200k if bitcoin is still there. So with 100 bitcoin, you will have $20 million of today's money. You shall live quite a good life then.