I think things would start being priced using different units. With your example of bread costing 0.000127 BTC, that could also be written as 127 "bits" or μBTC

I think things would start being priced using different units. With your example of bread costing 0.000127 BTC, that could also be written as 127 "bits" or μBTC. It would take a lot of getting used to, but it really isn't any more complicated than $1.99.