Major rebalancing idea

Hi there. I have an idea for a major change regarding game balance.

It is too big and intrusive that I'd expect it to be implemented, but I would like to share my thoughts and love to hear yours.

Season 7 was my favourite season so far regarding game balance and I am quite happy about how riot have evolved over the years, inlcuding the way that the patchlog is giving feedback to us players. What I observed during the last year was that Riot worked hard on redefining the roles of tank, adc(marksman), asassin and support by the addition of Gargoyle Stoneplate, lethality, healing/shielding power, new active items and all those vision changes.

Core Idea: Change Crit from being an adc stat towards being a stat for mages and asassins, in order to significantly lower adc damage towards squishy targets and to further distinguish ad-carries from asassins.

Implementation vaguely outlined

1. Change critical damage so that spell damage crits, not autohits.
2. Remove critical damage from Zeal and replace it with unnamed unique percentage health damage(allows stacking but punishes 1-item-stacking)
3. Remove critical damage percentage from Infinity edge and replace it with some cool adc stat( Maybe range per level or +5 movementspeed onhit stacking up to 10 times?)
4. Remove critical damage from essence reaver and make it refund Mana as a percentage of damage dealt to champions.
5. Slightly increase attackspeed cap, maybe by 0.5 attacks per second
6. Put 20% critical strike chance on the needlessly large Rod and 30% on every item that is built from it, lower the ap on these items accordingly to keep their power level.
7. Add 20% critical strike chance to serrated dirk and 30% critical strike chance to all items built from it. Like with the large rod adjust its other stats so that the gold price doesn't have to be changed

forecasted effects

1. Balance chaos due to too invasive changes
2. Higher threat towards adcs from mages and asassins
3. Higher focus of adc itemization towards tanks
4. lower threat from adcs towards squishy characters
5. balance issues around yasuo and Jhin