I like taxi. I think this is a good idea. I hope in my city also accept bitcoin. because everyday I use taxi.
As for me, the use of cash or credit card is still convenient for a taxi payment because right after people dropped from a ride from taxi then a payment should be made in just a seconds. I just don't think that bitcoin will work in that way with a high transaction fee. Thinking that a delay of transfers will create inconvenience for a taxi payment and other the same transactions.