I think that the main force preventing the widespread adoption of bitcoin is that elites don't have much inducement to use bitcoin.
The majority of bitcoins ever existing were already mined and are in possession of early adopters (mostly) and I don't see how current paper billionaires can redistribute btc toward themselves.
Current billionaires are unable to accumulate any decent % of their wealth (6.5 trillion) in bitcoin. Just 1% of 6.5 trillion is 65 billion, which is more than ten times BTC market cap.
Billionaires might be tempted if major currencies would be failing, but all major currencies are quite stable with benign inflation in most parts of the industrialized world.
This (transition from fiat to crypto) might take longer than I envisioned last year, maybe 50-100 years.
To maintain their wealth should bitcoin supersede fiat, your hypothetical billionaire would only need to acquire the same % of the bitcoin money supply that he presently controls of the fiat money supply. Let's consider only the USD.
US M2 is approximately $11.5 trillion, and let's assume billionaire Bob has exactly $1,000,000,000 in USD (we ignore his other assets [companies, real estate, etc] as these aren't directly affected by a transition to bitcoin). He thus controls
$1x10^9 / $11.5x10^12 = 0.0087%
of the USD money supply. To control the same % of bitcoins (at full issuance), he needs:
0.000087 x 21,000,000 = 1826 BTC
At $400 / BTC, that would require an investment of just under 3/4 of a million dollars--less than 0.1% of his total USD holdings. One could purchase this amount of bitcoins very easily without significantly moving the price.
So that's the amount he needs in order to "hedge." But our hypothetical billionaire is a billionaire for a reason. If he believes that his other fellow billionaires will hedge in a similar way, he can see that while his action may not cause much price slippage, the action of everyone hedging like this
will cause slippage--a lot of slippage. So now he has an inducement to actually purchase a speculative position on top of his "hedging" position--and to make those purchases sooner rather than later. And if he does this, he actually gains in a potentially big way should bitcoin adoption continue.