So, what we're left with after the nerfs and partial reverts is a slightly decreased stun width and significantly lowered Q damage at early levels. The early nerfs were definitely too harsh, but I think the E is in a good place now. Now, we just have to decide how much of a lane bully Syndra should be. She was pretty brutal before, but the lowered Q damage has hurt that a lot, and I think it's fair to say that while it was the original E nerfs that made Syndra temporarily unplayable (due to missing a lot more stuns throughout the entire game), the Q nerfs are probably largely responsible for her currently lowered win rate.
I think that Riot has to decide whether they want her to be a (more or less) good champion, or just playable. She's playable now; you can pick her up and not feel like you're committing a sin against your team. But I think she needs just a little more (somewhere) to be good. If you look at her stats as a function of player skill, you'll see that they do go up with level; her Diamond win rate is around 48%. I still think she's just a little underpowered, though.
As a Syndra player, I personally believe that the best balance choice would be to put the Q right in between where it was and where it is, 60/102.5/145/187.5/230. I'm pretty sure that won't happen because they want everything to be rounded off to 5's. Assuming we want to leave Q where it is, I think the best way to give her a small bump might be to decrease the mana cost on Q (and/or W). This isn't as random of an idea as it might seem. Syndra's mana costs were placed somewhat high to compensate for how powerful the spells were. Before, landing a few Q's did good work poking your opponent out of lane; now, the lowered damage means that you'll need a good number more Q's to do the same job. The problem is, firing off that many Q's will run you out of mana really quickly. Lowering the mana cost on Q in particular would give Syndra back the ability to poke her opponents out of lane, but make her "earn it" because she'd need a few more hits than she used to need. I also mention W because its mana cost is actually really high (60/70/80/90/100); you use it a lot to farm, but that also really hurts your mana.
From Riot's perspective, I don't think giving damage back to Q is going to happen. I do think that lowered Q and W mana costs is something they should check out, though. A lot of their recent nerf/rework decisions have focused on giving champions the potential to do powerful things, but making them work more for it. Right now, Syndra has a lot of trouble bullying opponents do to the combination of low Q damage and high mana costs. By addressing that problem through the mana costs rather than the damage, Syndra could regain her bully potential but require more skill to realize that potential, which I think is something Riot might be interested in.
All that being said...I imagine Riot is probably happy enough with where they've got her that they're be focusing their effort in other areas. So, I'm pessimistic about any small buffs being forthcoming.
