If they release on one console system, they would be exclusive.
Assuming the aim was to damage Playstation is a bit much and a bit fanboy-y. Bethesda was bought to build Xbox up....into the console platform where you could find Bethesda games. Unprecedented, definitely. Unfortunate, definitely. To assume malice in the business end of this situation is more of a personal problem and only serves to cause strife between camps. I can proudly and happily say I own and play both systems and think more gamers should be less tribal.
The game were always going to be on Xbox, correct, but now they're only going to be on Xbox. Just like how Spiderman games used to be multi-plat and they were always going to be on Playstation. So why was Spider-man made exclusive? To damage Xbox? Or to make Playstation the only place you could play Spider-man? And that was for the good of Playstation, good for them. They had the chance to make Spider-man entirely theirs and they did it and I'm sure you didn't blink an eye. No, in fact, I'm sure you celebrated and laughed. I've seen you do it. Nothing wrong with that. But a bit hypocritical.