Another problem with advertising at SkyTrain stations

Poster frames at Vancouver SkyTrain station

On top of the common problem of out-of-date posters at SkyTrain stations, now we have an even worse problem; empty frames.

Even filling the frame with something institutional ("Stay behind the yellow line"), or for a charity, is better than leaving an empty frame on display.

And the more out-of-date posters, or empty frames that riders see, the lower the perceived value of advertising at SkyTrain stations in particular and on transit in general.

I wonder just how much longer transit advertising will survive in Vancouver?