Turkish will not be affected that much since they only fly to Delhi and Mumbai. They have more destinations in Pakistan than India! Turkish added more novel 1-stops from Logan than any new carrier so far.
Absolutely. I have a brother in the Peace Corps in Rwanda and I did a multi-country trip (Rwanda and Tanzania/Zanzibar). Turkish was the only airline that would enable me to fly a 1-stop open jaw trip from BOS - Kigali (via IST) and return ZNZ - BOS via Kigali. Turkish's route map is excellent and connecting in IST is a breeze. Their service is wonderful too. I'm happier about Turkish than just about any other airline at BOS for leisure travel. Especially since they're Star Alliance.