I don't think that is true, because one thing you just need to understand is that the higher the adoption of Bitcoin, the more will it's price skyrocket so high so as to enable more people have access to it's limited supply in circulation. Because you can remember that 10yrs ago, 1 Bitcoin was around $1, of which had the price remain so, just only one person would have bought the whole Bitcoin, of which I'm sure by now bitcoin would have been a dead project, but for that not to happen, the price kept increasing as the demand for Bitcoin increased also.

So I strongly doubt if there will ever be a time when the amount of Bitcoin will never be enough