bitcoin investors don't go for gold, they either already have gold as their other investment for diversification purposes or they don't. what they never do is to sell bitcoin to buy gold instead!
says who? i've personally known multiple coiners who sold bitcoins to invest in gold at various points in time. they figured bitcoin was near the top or was in a bear market and gold had better prospects (since it hasn't pumped since 2011).
a lot of bitcoiners put their money (including BTC) into whatever they think will generate profit. that's why pirate40's ponzi scheme was so big. it's why altcoins are so big. i think you give bitcoin investors too much credit.
there is a difference between hardcore investors (or better called traders) who are making money from investing their money constantly and with regular investors who are actually "investing" their money in something to make profit in long run.
a trader doesn't give a shit about what he is buying, yesterday it was bitcoin, today it is gold and tomorrow it will be something else like silver, stocks, an altcoin, and a ton of other things. they constantly move around not letting their money sit idle in some investment.
as a result you can't really say "bitcoin investors are moving to gold" because that is no what's happening.