local ground transportation is not "duty" like today, but if the ground times are excessive and you had a min layover it could result in being "counted" as to not get you your 8 hours.

At our company, we have a minimum 10:15 domestic layover already and 12-14 international so this should not cause much problem except for some exceptionally short international layovers in which case the beenfit of being downtown, even today, is not a big deal to me in those cases.

from the regs explanation:

Carriers will be required to provide their crew with a 10-hour rest opportunity prior to commencing a duty period that includes flying. While the 10-rest period may include the amount of time it takes to get to or from a flightcrew member’s house or hotel room, the actual amount of time required for a sleep opportunity may not be reduced below 8 hours

lots more reading required by our scheduling pros before we do anything stupid,in the end though one level of safety should be one level of safety ! no carrier should get a pass or be able to hold a decision like this out as bargaining fodder. Science based rules, that were largely based on comments from cargo pilots and those that need the nighttime protections is criminal that we are even having this discussion.

I for one am taking it to my congressman and we all need to be doing that and fight this in the public eye. IMHO.