Nah, the hit looked kind of tame, but the effects were immediately obvious. He got his bell rung, and it's smart to keep him out for at least one game in my opinion.
As for Sanchez: He's only had 5 turnovers in 2 games. It's not some catastrophic meltdown, chill out. Sure, it's a bad stretch, but the team's got some real issues that have nothing to do with their solid, improved from last year QB.
They passed 44 times against Miami. That's NOT the Jets offense, and that's not Sanchez's game.
More passing attempts might explain how he got sacked 6 times, but 6 is waaay too many sacks to give up. The O-Line had some problems. Honestly, getting sacked 6 times and only having 2 turnovers is a small miracle.
Don't get me wrong, I'm not saying he's the greatest young QB out there, I'm just saying that despite these two bad games, his season is amazingly better than his rookie one was. Matt Ryan and Joe Flacco had pretty awful second years, so his ability to remain constant despite the newfound respect defenses are paying him is impressive.