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You're right, still need a manual time keeper. However in 10 years from now, will it still be manual? I'd doubt it. So it's a case of when and how it'll be phased in. It might be measured to seconds, but when people are chasing small advantages, it could become hundredths of a second. We're not world time trial racers, but that's times to thousands of a second iirc.
skinny-
"We time to whole seconds"
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However in 10 years from now, will it still be manual?
Probably. The technology to do electronic timing is hardly new. It was available 10 years ago, and we don't have electronic timing now. And I can hardly see the supply of superannuated former testers capable of holding a stopwatch drying up to the point where there's no old codgers to act as timekeepers available. In my club we've got any number of more senior members who can do the time-keeping. Trying to find one who won't die from the strain of doing pushing-off duties is the hard bit.
hippy
Brommers
Why? It achieves precisely nothing, because it still needs a time keeper to do a manual back up. We time to whole seconds, so there's no call for greater precision. Transponder timing is a solution in search of a problem which time trialling simply doesn't have.