Quick, before the neighbours over the road put Olivia onto training wheels, go out and get a copy of the latest Australian Cyclist and show her parents the article about balance bikes. If Olivia's parents just take off the pedals, everyone will be happier (and most especially Olivia)
The family across the road tried for ages to get their daughter (4 years old) riding but she wasn't at all interested. They picked up a JD Bug on loan and suddenly she was riding everywhere and loved it. Just returned to her first bike but without pedals and still loving it and will be riding with pedals in a week.
I spent part of an afternoon trying to convince one of my mate's kids to give up the training wheels to no avail.
Any kid I've taught with the scooter method has caught on pretty quickly.
The thing I realised is that they have to want to do it. - No amount of sweet talking will bring a 5yo around.
Give them a crutch and they'll cling to it.
Teach them good habits early and they'll remember.
I tell my kids go as fast as you like as long as you can stop.
If you can't pull up in time - you're out of control.
Demonstrated by my youngest pulling off an emergency braking situation to avoid crashing into a 4 o that had appeared suddenly.
My friend standing nearby was bracing for the impact as Dan brought the bike to a halt.
Bike games are a good way to teach them handling skills.