Let's assume that someday BTC reaches 5% global wealth (for reference, gold is somewhere around 2.5%). Then, look at the global distribution of wealth (pic related).
Suicide Tier: < $10k
This represents 3% of wealth, and 71% of people.
21m * 3% = 630,000 BTC
7.53b * 71% = 5,346,300,000 people
On average 0.00011784 BTC per person if BTC was 100% of global wealth
Factoring in target of just 5% of global wealth:
>0.00235677 BTC or less, might as well end it
Wagecuck Lifer Tier: $10k - $100k
This represents 12.5% of wealth, and 21% of people.
Go through the same calculations as above.
>0.03320053 BTC and you'll only have to work until you're 65
Comfortable Wagie Tier: $100k - $1m
This represents 39.4% of wealth, and 7.4% of people.
>0.29697427 BTC for a content, middle-class working life
Hookers & Blow Tier: $1m - $5m
This represents 26.6% of wealth, and 0.63% of people
>2.4 BTC and you're in a good place. Still need to work, but you can probably retire in 10 years, or blow it all in Phuket
Truly Made It Tier: $5m - $1b
This represents 15.8% of wealth, and 0.069965% of people
>12.6 BTC or more and you will officially make it. Enough to be a NEET for the rest of your life
Ascended Tier: > $1b
This represents 2.8% of wealth, and 0.000035% of people
>4462 BTC to challenge the gods
There are of course circumstances which could sway these numbers higher or lower. For example 5% of global wealth is very optimistic. But on the other hand it's estimated that 4 million BTC are lost forever, increasing scarcity.