He's expected to be. Top 10 picks at QB are usually considered to be franchise QB's until they prove otherwise.
Regardless of how you categorize Sanchez right now, the point stands.
Odds of winning a championship without a franchise QB are extremely low. Almost non-existent, unless you have a once-in-a-lifetime defense like the 2000 Ravens.
doesnt matter whats expected. as of RIGHT NOW he hasnt played to that level