With games such as COD and Assassin's Creed: Syndicate, the exclusive content that the PS4 has had is usually DLC type stuff (extra side quests, maps, weapons etc) With RotTR, this was a full game.
I think a lot of people have hit it on the head that MS was spooked with Uncharted 4 scheduled for release at the end of this year. So threw a chunk of change to get this timed exclusive
I get that there are exclusives on both consoles, but the norm is usually titles from a new IP (The Last of Us, Uncharted, Halo, The Order 1886) Consumers get annoyed when its an IP they probably have played on their preferred console only for it to be closed of to them. I'm talking as PS and Tomb Raider fan.
Was I annoyed that RotTR was an Xbox exclsuive? Yes, but I knew that I had Unchartered 4 to look forward to.
I think that CD, depending on the finances etc, may now realise that it was fools folly to have MS as the exclusive first run. I think MS may also see that this may not have paid off as they wanted. I do hope its not the end of the franhise as I really liked Tomb Raider and will probably pick up this when it is released next year. (Providing that there is no sequel to The Last of Us out at the Same time)