So the battle of Lepanto was a very close run affair, and very easily could have gone the other way and lead to an Ottoman victory. Although the Ottomans were able to rebuild their fleet, they never really managed to recover to their former sea strength, partly due to the loss of so many experienced sailors and officers, which were irreplaceable.
So what if the Ottomans had won at Lepanto? The Ottomans would have bested the Christians 3 times out of as many sea battles, and it would have resulted in a massive loss of experienced officers and sailors on the Christian side, much as what happened to the Ottomans-what effect would this have on the future of Ottoman sea power and power projection in Europe? Is another go at Malta likely?