Interesting with that pic - that looks a lot more like a bike lane than a shared lane.
Education is certainly the key. Without it, it's all just window dressing/greenwashing.
I see sharrows as designating preferred cycling routes, on existing roads, and giving newbies some confidence to ride a specific route. I also think they would encourage newbies to develop safer cycling habits (ie: not clinging to the extreme left of the road).
If the newbies favour some roads, and numbers swell, those roads become safer. I guess my point is, if you are going to have a preferred cycling route (which, I can see a few plusses for - especially with newbies), it makes more sense to have sharrows than it does to have a bicycle lane. Especially the types of narrow lanes they tend to paint.
Using Canning St, which basically operates in this manner already, as a pilot would build knowledge/recognition, and could start an education campaign...
Hey... what's that pink thing with a curly tail sailing through the air over there!?