All kidding aside, I'm guessing that Mazda service departments are going to check the ATF fluid level and condition in 2011+ cars by pulling out the rubber plug and inserting a regular old fashioned dipstick into the tube. If your dealer does an oil change and Mazda Full-Circle Inspection I bet the Automatic transmission fluid level/condition item will still be checked on the Inspection Report Form. How do they inspect the fluid level and condition if they don't use a dipstick??
I'm not certain, but I think deleting the dipstick is maybe supposed to thwart do-it-yourself ATF inspections. Maybe the concern is related to temperature. Mazda specifies that the transmission fluid level must be inspected when the transmission fluid is at 65 degrees Celsius +/- 5 degrees. Outside this narrow temperature range, the dipstick reading is inaccurate. In earlier cars the technician was supposed to insert a temperature probe into the transmission through the dipstick and monitor transmission temperature as the car was running, waiting to check fluid level until the specified temperature was indicated by the probe. (The probe had to be the same length as the dipstick!) In later cars the temperature is supposed to be monitored through the M-MDS diagnostic system. I think Mazda figures that since most owners can't accurately measure transmission temperature, the ATF fluid level check is best left to the dealer.