Aside from the fact he doesn't want to play 3C on a team like Montreal, so I doubt he wants to do anything close to it here.
One thing important to consider here is that Danault does not want to be the 3C in Montreal behind Suzuki AND, most importantly, Kotkaniemi. He does not want to get pass over when he has been the defacto 1C for 3-4 years. The reason why is strictly financial IMO. If the perception is that you are a 3rd line center, you will get less money... especially if one of the two guys in front of you (KK) is nothing special. "Look Phil, you are our 3C, we can only afford to pay you as such."
Here, he would be behind Crosby and Malkin. He would basically have the Staal role. Would he be strictly a rental? Yes, most likely. He probably would not want to be stuck being a 3C. Would playing the Staal role here more beneficial to him financially than playing the role he is in Montreal? Maybe. Especially if he can maintain his 5v5 production and nobody wonders why he is not on the PP... people will know why here. In Montreal, it can raise questions (and does). Also, Danault here makes the Pens a bigger contender than Montreal. Winning a Cup would increase his value. That being said, I do not think we would be a real contender, even with him.
That being said, Montreal would be absolutely foolish to trade him. As I said, they are in a very good position to potentially come out of their weak division and Danault is their only proven center. Suzuki is trending to be very good to great and Kotkaniemi is settiling into a 2C... but both are very young. Danault is still handling most of the tough match ups. Their depth is why they have a chance. Trading Danault would
Thing is, I doubt he wants out of Montreal, but he also wants to get paid and he is likely to be the sacrificial lamb, unless he takes a discount, considering both young Cs will have to be re-signed pretty soon. If I had to make a prediction, I'd say he will re-sign in Montreal for around 6M a year. They are gonna have to do some maneuvering to stay under the cap next year though.