I'm worried about fees going too high when Bitcoin gets mass adopted. (I don't need to explain, 1 block every 10 minutes)
If Bitcoin fees go to $100 or more per transactions, then it's not viable for low and middle class, for mundane tasks like transferring some to someone, DCA a monthly low amount,etc
Layer 2 doesn't seem to be the solution. Layer 2 means risk.
The beauty of Bitcoin is how secure it is to just store your Bitcoins on the layer 1
And that's why (one of the reasons) bitcoin won't be used to buy coffee.
And you won't need to make transactions with bitcoin, because it will be used (more and more often in the future) as an investment tool. Have you seen investors transferring shares, for example, SNP500 back and forth every week?
We will probably see $100 (or so) commissions at bitcoin's price of $1M. Do you think anyone will be very upset about this? Unlikely, because everyone will go crazy with delight at the price at that moment.