I'm not a fan of face coverings, but if a law is impractical to enforce, as Bill 62 appears to be, then it shouldn't be passed. If I was a bus driver in Quebec or any other public servant being expected to police people's attire in this way, I would refuse to do it. 

That being said, I think articles on the niqab/face veil issue tend to exaggerate the extent to which this attire represents women in the Muslim community. The proportion of Muslim women who cover their actual face is very small, so I think it's disingenuous to argue that legislation targeting them is an attack on all Muslims. A much larger number of Muslim women wear the hijab and no reasonable person has any objection to that form of Islamic garb.

It's also worth noting that the popularity of Islamic head gear of any sort varies from decade to decade and is therefore not a fundamental component of Islamic culture. If you see photos of Iranian or Turkish women in the 1970s, hardly any wore the hijab.