Celerity needs to be added as a passive to Phase Rush and removed as a separate rune
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Every champion that Celerity was intended for already takes Phase Rush(Asol, Cassiopeia, maybe Taliyah), no other champion ever prioritized movement speed quints except for Asol and Taliyah.
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Phase Rush is already balanced around the existence of Celerity(hence why it's so undertuned), adding it as a passive to Phase Rush means that the activation MS doesn't need to be buffed which is healthier for the game overall. Riot already stated they intend on buffing Phase Rush in the future.
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Celerity should not in any way be stackable with Fleet Footwork, and it's one of the most unfair interactions in the game. Fleet Footwork is not only hands down one of the strongest runes but it's interaction with Celerity means that it will always crowd out other options in Precision for ADC.
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Celerity should not be the most popular secondary ADC rune. A number of mages are already balanced around their mobility(Asol, Cassiopeia, Taliyah) and need MS to just be able to do damage. ADC have point and click auto attacks and are supposed to be balanced around low base MS in lane specifically to give aggressive supports a chance to counter their hyper scaling. ADC are not melee champions, and they are not mages, they do not need such high MS in lane.
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Magical Footwear exists and should be the healthy choice for ADC, 10 extra MS when they get boots but none before then. Celerity gives ADC too much flexibility and safety in lane.
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Sorcery needs better secondary rune options for primary Sorcery users, and needs to be made less appealing as a secondary rune tree overall.
Remove Celerity from Sorcery, add 3% movement speed to Phase Rush. Celerity does not need to be nerfed as Riot has implied it needs to be outright removed from the game.