I doubt many early adopters are still holding their coins.
many early adopters (especially those who mined) do still hold, those in it to make bitcoin a true currency, kinda defeats the whole purpose if you trade it for fiat (but thats lost on most people here nowadays).
i've been in cryptos awhile and i personally don't trade for fiat (what seems crazy in short term pays off in the long as its more crazy to trade a deflationary currency for an inflationary one).
those who weren't in it for the fiat are the ones who (on paper) are now worth more then those who where
Do you hold large amounts of bitcoins you mined in the early days?
nope, anytime I've got decent amounts of btc I trade them for ltc and other alts, but ltc is my biggest holdings (basically the choice between being a moderate holder of btc or one of the largest ltc and other alts holder). I've never been a huge miner most my holding come from trading.