I don't think that, profit wise, it would be wise for EA to not have yearly editions of NFS. As NFS builds on the same engine every year, it's one of the rather few series that EA certainly earns money on.
Across the Ps3 and X360, the Need for Speed series actually have 25% of the total racer sales. That's likely to drop a bit to ~ 20%, but still - NFS is enormous in its genre. Very few series hold as large a percentage of the total sales as NFS does.
There's little EA can really do to boost the interest, at least as I see it. The racing genre has had a decline, but NFS is still a large series, and it's likely to be rather profitable as it is.







