Originally Posted by Yoonabomber
Alright since you're serious, let me give you a quick run down.
Riot won't significantly nerf a champion simply because he excels in Dominion, Twisted Treeline, or
Proving Grounds. Riot bases their balance around Summoners Rift.
Sure they'll try but it usually ends up not working at all (remember the Kassadin "nerf"?). You have to convince Riot that he's over powered across multiple game modes that include Summoners Rift.
Additionally, Jayce is a "high skill cap" champion as most like to put it, meaning if the person doesn't know how to play Jayce, he's going to get smashed.
Finally, in closing, if you play Blind Pick you're going to have to accept the fact that people will play OP champions simply because they can. If you need help bottom lane, you should be asking for ganks from someone with high mobility or gap closer so Jayce can't escape.
I hope this resolves your issues.