Eventually the gamblers and gullible will run out and those already financially vested in coin of your choice who on the weekly or monthly buy $x more, also adding to and keeping a reserve of $y to buy during dips which also helps to make the price look artificially more stable than it is [not to mention when billion dollar reserves get spent to counter the bottom completely falling out]. After that it will only be through aggressive tactics including regulatory capture that force more people, let's say 50% of population adopted, they will need the remaining 50% to adopt - to give them the basket, leaving them holding it - with no one else to buy it from them.

What will, and is happening, you just don't see it as much - it's not as obvious because no one is making money or wanting to make money by taking a stand against Bitcoin, and draw the attention of the heavily invested ideological mob of HODLers - whereas everyone taking a stand for Bitcoin is financially incentivized to promote it with whatever true or false rhetoric and propaganda they find works best in the present climate; perhaps the best simplified comparison I heard is that Bitcoin is like Mary Kay for men.