How are you finding the end game so far? Seems a bit bleak to me, but I do have hope for improvement in later patches. PvP content for one.
I am not a PVPer at all, only PVE so I can only speak for that side of the game. At 50 you get to redo all the dungeons you did or not do during your levelling process, they are called expert versions of them. They are nothing like the originals though, layout and stories inside yes, bosses no. I am finding the boss fights very dynamic and dangerous. You progress by getting tokens from bosses (1 each on the easier dungeons) and 10 from doing one of those dungeons on a daily quest. The lowest purple item you can purchase costs 40 tokens.
Sounds familliar? Yeah, I am sure it does. As I said, doing the dungeons is an experience all on its own, people have to talk, strategise, swap roles to succeed, it is good fun.
Thankfully, this is not all there is to do or I would go insane. It can take a long time to get into a group and then usually the first boss breaks the group up, they are that hard. I hate daily quests, but the ones in Rift are fun to do, they alternate from day to day as well. Then there are Rifts. The rewards from events are also great for personal progression. If you can get 5 buddies at level 50 together then you can do expert rifts. This is a 5 man group rift that you initiate and do in the open world. Still have to do those.
For me, endgame is not bleak at all, it is rather fun. It all depends on your expectations. I am not expecting to raid, I don't even want to. I am not expecting even to complete a daily dungeon every day, I feel lucky to get past the first boss. I bought my first purple item using 40 tokens today and I felt happy ;-). It is a long term progression I can deal with.
To sum it up, I still have not felt the need to play an alt at all. It is a good feeling.