I don't know why people focus on "Sony fans".
As a Tomb Raider fan I'm not happy with this decision because it's going to cripple the series sales, it was going to become huge hit after the reboot, but by making the sequel exclusive and shunning away the biggest fanbase it's only going to bite them in the ass. It's a step back, it pisses of fans who own PS4 and PCs and they will lose interest in the series (especially the casual fans).
When FFXIII was announced for X360 I was happy because it meant more people were going to play the game, on the other hand RoTR not being on PS4/PC means less people are going to play the game.
It's not about being a fan of this or that console, it's about being a fan of the franchise, there's a reason a lot of people are angry over all the Tomb Raider fansites, especially when they bought the Definitive Version to support the sequel.