As with anything else involving riding in traffic... you take your own risks. If you misjudge the space and end up gouging a door or knocking a mirror off, well... just like any other fender bender... it's your problem.
RTI actually sums up the need for education and awareness between drivers and riders in the statement on their website:
"– If pursued, we will work with the city on an advanced signage/messaging campaign along the proposed corridors to alert drivers of the upcoming change. Ideally, this messaging campaign will have a 6-8 month lead in time prior to the launch of the pilot
– RTI will not support the initiative unless an active messaging campaign is deployed well in advance, additionally, we will work with media partners to get the message out to riders about the right & wrong way to perform the activity if and when the pilot is approved"
At the end of the day, no amount of education, training or resources on proper filtering tactics will fix bad judgement, ego, or just plain stupidity in either camp. The good thing is, if/when collisions occur, the research suggests that the risk of serious injury or death is significantly reduced (in slow speed filtering... not ridiculous high speed lane splitting).
But it's a new type of manoeuvre for most riders. The very few times i did single track i realized how narrow a motorcycle is... next up was following cyclists on streets with street parking that leave enough space to ride on the 1/3rd of lane left, i can pretty much fit most places a cyclist would go...moto gymkhana also helped build some more confidence in slow speed riding.
but for people who don't ride in those conditions often... the proper judgement might not be there. The messaging campaign is great, but the training aspect of it is lacking. Yes it will be included in the new curriculum but the existing riders will just have to "wing it"?