This was a number 96 tram in Bourke Street on Friday afternoon:
Similar scenes are seen in morning peak around much of the tram network, during the lunchtime rush in the CBD, as well as the evening peak, as well as weekends.
Now imagine it with Myki: everyone touching-on and off their cards as they board and alight, at 2 seconds+ per transaction.
If they can speed up the scanners, that will help. This video shows that a Hong Kong Octopus scanner takes only about 0.3 seconds to respond.
But even that may only go so far. Putting scanners on tram platform stops would also help, but there’d have to be some way for people getting off the tram to tell there was a scanner on the platform they could use, otherwise that wouldn’t work either.
Another idea is, noting that most bus and tram trips are short distances anyway, making them a flat fare like London’s buses and trams, so you don’t have to touch-off.
If nothing happens, expect the trams to get even slower than they are now.