I sometimes get a Trinity Force on him, but only if I'm doing well enough to the point that I can get it before the 20 minute mark. If you can get it, his power in lane is atrocious. With a good support, it's almost impossible to lose that lane, which then means you have a nice transition into mid game. He becomes very fast, his W spam allows him to proc trin force repeatedly, and it just improves his overall performance. Now, I'm not gonna say it's core, because it definitely isn't.
A small range buff would be nice, I like the idea of boosting him up to 575. The only issue that I could see though is his range combined with his mobility might make him a bit too strong. Think about it: everyone that has high range is usually pretty slow, except with perhaps one escape ability that isn't instant (Cait's slow shot, Trist's jump). With his very high mobility for his class, a range buff might be too much. But I dunno, can't say for sure unless it actually happened, which I don't think it will. I can see him being one of those guys that Riot never really touches.