On Sat, 23 Jan 2010 04:34:33 -0800 (PST), Mizter T
wrote:

Valid question, one that I've pondered on before. There is some
precedence, as the paper one-day Bus Pass was withdrawn by TfL in
January

A significant difference, however, is that there is an Oyster bus/tram
price cap of £3.95, with AFAIK no equivalent of the out-of-boundary
tickets valid on buses. So there is no real requirement to have paper
and Oyster bus-only passes co-existing because they serve exactly the
same purpose.