That kind of thinking might be fine if market share is pretty even. But when you're going exclusive to a console that looks like it could have only half the install base of the console that has traditionally seen the best sales for the IP then it takes some pretty fuzzy maths to show that exclusivity is likely to be more profitable with more sales. And it's exactly the reason this is a timed exclusive, not even MS is willing to stump up the cash to make permanent exclusivity the financially best outcome. I think it's probably true that the monetary support from the timed exclusivity will more than make up for the lost sales from PS fans who will feel betrayed and will rage quit TR. What companies can rely on is that gamers over all don't hold grudges about timed exclusivity deals.
Isn't it also the case that Sony makes publishers sweeten the pot for late ports to PS? And that will actually help the eventual PS sales.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
