Why would Lopez opt out, though?
Considering his frequent health issues, he might want to opt out to get the security of a multi-year deal.
That's exactly why he wouldn't opt out -- he's going to get another contract after this one, failing a career-ending injury, and as an offensively gifted center operating after a massive increase to the salary cap, he's not going to be left starving.
What he won't get is a fully guaranteed $16 million next year if he does leave the Nets.
Even if Lopez and Thad Young opt out, I don't think that they'll have significant cap space. They might be slightly under the cap, but not $16 million under.
Don't quote me on this, but I believe Joe Johnson has a salary cap hit of 57 million next year
This is not correct, by the way Johnson's cap hit is going to be $24 million next season.