Yes karnataka have most of its part as forest area western Ghats which are resistant to make new lines passing them.. On other hand Kop vaibhavadi also pass through Ghats it seems but their it don't have forest land like in karnataka.. It's better to connect Goa with Miraj Solapur Latur Nanded etc via this route.. Hope it completes soon. Talguppa Honnavar is important than Kop vaibhavadi as it becomes short direct route to karwar and Goa from Mysuru, Bengaluru and even chennai. Hubli Ankola on other hand is just alternative for Braganza Ghats for freight purpose..with some passenger services..