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Wether or not Leye herself explicitly condemns Sagan is not really of interest to the case, I would say. An argument like this often occurs when social practices are addressed by people demanding change; a member of the affected group claims it does no harm and is now supposed to have spoken for the entire group. Besides this, it also implies that only this affected group can be the final arbiter of the matter. This is not true.
While related via our concepts of sexuality, gender and the way gender is used to prescribe social practices, there is a difference between the matter of groping a female body and the display of female bodies as trophies. It is this last issue that the OP wants to address, I believe. This is not so much about spoiling the experience, but constitutes a demand to change a social practice that arises out of culturally constructed gender dynamics that we no longer want to see performed. The performance of these dynamics is what constitutes them and vice versa, this is the paradox of culture.
The argument arising from this is that by consciously removing a certain performance from the public space the perception of the relation that the practice depicts can also change. This would finally mean that the practice becomes meaningless. We don't now thank the Egyptian God Ra for a victory because we do not believe this to be significant. We might in the future just award someone a trophy and leave it at that.
Finally, you are right that this may not incite people to suddenly cheer on female professional cyclists. I can only say that this is (hopefully) not the aim of this campaign, as it would severely complicate a relatively straightforward request. Yes, @Van_Damage, a long game. As has been indicated, it can be rather stifling to examine every expression of inequality at once. Having one race change it's ceremony would be the most powerful statement at this point! :)
I understand the objections to silly, inappropriate outfits and sexist behaviour. Maja Leye springs to mind. I heard a radio interview with her and Marianne Vos, both saying they saw no harm in the tradition of ceremonies like this though. And most female pro cyclists I have heard speak out about this would rather have nice podium guys handing out the flowers in their awards ceremonies.
I'm unsure about the the fact that flowers and awards are being handed out by women who kiss the winner is a serious/determining factor in spoiling the experience of watching pro cycling races for many people, male or female. Also I find it hard to imagine that the disappearance of these girls from the stage will somehow boost coverage of women's races. Other factors (like not having the Giro Rosa in the same time slot as the Tour de France) will be more important I think.
Of course, there's always room for new traditions. A positive approach may work better than expecting (judging) that 'if it were to be a female cyclist she'd be likely scrutinised in the same way as the 'podium girls'' though.
Good luck with the campaign, seriously interested in the replies you'll get from the teams and organisers.