Benzema's future is still ambiguous now. There is still a possibility for him to leave Real Madrid by the end of the season. But it looks like he wants to stay for one more season at least. It is clearly visible that he enjoys his game at Real Madrid now. Especially his performance in the recent times has been worth watching. Maybe he is 35 years old but this isn't any hindrance for him to show a high level performance anyway.
Not every striker can be this much helpful for their team after starting to get quite old. Benzema is a special striker because of that. Especially after Ronaldo left the team Benzema had a huge opportunity to shine much more than before. He has had a big role in the successes of his team. He was even the MVP of the team last season. I hope Real Madrid keep him for another season if they don't plan to make a top signing for his position this summer.