IMHO the Hurricane was a poor fighter aircraft. So if the Hurricane was the primary fighter during BfB and they won I am sure another fighter could have filled successfully the role of the Spitfire for the BfB. British aircraft designers certainly didn't lack creativity and skill. If not else, I can picture a P-40 with a merlin engine filling the job...
Perhaps losses to enemy fighters would've been higher but they would've still won in the end.
After all it's the pilot, not the machine.
Also, I don't think all those allied pilots would've been one single bit less determined to bring down enemy fighters and bombers if all they had were Hurricanes.
The biggest problem are the offensive operations over the channel. But this doesn't depend so much on the Fw-190 as on the performance of the fighter replacing the Spitfire, I think. Eliptic wings aren't a magic formula that makes a fighter fly better than all the others. So it's possible another fighter just as good would've been developed. All in my humble opinion of course.
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