They won´t be obsolete, still usable for the current content. And we could go on an on about the things Bungie has done that the community has desired, I could do a whole list of them if you were interested. TTK pricing change made sense from a business perspective because Bungie is a company which is logical, they need sales. But the fact is that a change happened because the community voiced their opinion. As with many other things.

Actuallyy, if enough people leave then a guardian will not take their place. Most have already bought the preorder so they are safe this round. I haven't purchased but likely will to give them the benefit of the doubt. However, corporate DLC practices and having to leave all gear behind at each expansion may cause me to reconsider future purchases. The game in part was sold as a MMO with customization and until recently we have seen little of that. Forcing everyone to buy and wear the same gear is a step backwards for customization since everyone will have to wear the same raid gear again to be relevant. Hopefully transmogrification makes it into the game so if we do have to ditch favorite guns we can at least have the weapon skin on a new gun.