That seems somewhat foolish - a driver delayed by such an event is liable to be angry and complain rather than feel that surrender is necessary.
If other posts in this thread are correct (let's walk out on that limb), and politicians try to meet the demand of drivers over cyclists, then this is more likely to lead to stricter laws against cyclists as a result of drivers issuing (very justified in this case) complaints.
An effective protest wins both sympathy and ire, and leads to more voices calling out for your cause - this one just inspires ire. It doesn't unequivocally paint the picture "vote for cycle infrastructure or else", it more emphatically implies "too many cyclists will add to my commute, just look how bad it is now, we need less of them, so I will now vote against anything for cyclists".
Just to point out, for the record, I'm in the third camp - pedestrians. I've seen drivers dangerously overtake, I've seen cyclists randomly pull out forcing emergency stops, and I've seen both put pedestrians at risk with self righteous indifference. My take home from the post is "more legislation is needed for cyclists using the road inappropriately", not "we need more cycle lanes" and definitely not "we need more shared space sidewalks".
Well, that was a mass of criticism for a critical mass; one wonders if the critical masses will mass against this criticism or perhaps such masses will critically reflect instead and engage in mass critical thinking!