By Lenn Thompson, Editor-in-Chief There is little doubt that riesling rules the Finger Lakes roost, but what grape will be the one on which the region's red grape reputation will be built? The jury is still out I think. Some say cabernet franc. Other content that Blaufrankisch is the grape. Many blend the two in what might be a signature red blend. Maybe it'll even be a hybrid, though the potential is probably limited there. Then you have a small, dedicated group of growers and winemakers who think that pinot noir shows the most potential — but only in the…