After few years bitcoin price maybe $5000 or already replaced by other currency.
even if the price of bitcoin is 5000$ still not enough to replace the other currencies we all know,
if we accept bitcoin as a currency, bitcoin must have a fixed price.
$5000, i think he is not talking about 5000 BTC. But if he is telling that 5000 BTC, so it is too much biggest amount. i think no one have this amount of bitcoins in Bitcointalk.
For me reasonable bitcoin 1000 Bitcoin is enough but we are saving for 20 years, it is long time period, if we save now 100 Bitcoin in this time i m sure it is also enough amount for 20 years.