Ezreal doesn't need more buffs
The champion isn't weak right now, and you can point to his winrate but the simple fact is that people don't know:
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What to build. 9% take IBG as first item, a 43.81% winrate strategy. Muramana has a 49.66% winrate.
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Ezreal's skillmax order. 15% of Ezreal ADC's max QWE which is a 47.65% winrate strategy. QEW has a 50.44% winrate.
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When he's strong
These players drag the winrate down because they follow very bad strategies. I'm not saying that you can't win by following suboptimal strategies, but a champion should not be balanced to have a 50% winrate when taking those strategies, because when an optimal strategy is taken, the champion will have a far higher winrate with it
Ezreal is really on the edge of being busted, in my opinion, and I think the balance team should just sit back for a while and see where the dust settles before making further adjustments