First of all for now, 30 cents worth of BTC was enough for me to get confirmation approximately in 10 minutes. Also, such things as LN are designed to simplify such "coffee transactions". And this solution becomes pretty popular. The other question is that why should you pay those $2-3 in BTC while there is a chance that tomorrow it could become a $4 worth of BTC? At this point it seems much easier to pay in cash.
Aside from fees, we are right now in the speculative fever so why waste your Bitcoin just to have a coffee? I would rather hold my small bitcoin and see where this bull run is going to. And yes this is the problem on the currency side of bitcoin people are not daring to use the bitcoin just to buy anything and on the side of the merchants they can be disappointed to realize that not many are actually using bitcoin to buy something from them. Is there a solution to this? There is and that is to make bitcoin not volatile but the problem is how to make it like that...any idea?