I think I'd enjoy your world for a while but, who really knows? Sometimes the things we think will make us happy turn out to be disappointing.
If we were born into your world, we'd have nothing to compare it to. Nothing to feel grateful for really because maybe the opposite wouldn't exist. Isn't that why we're grateful? Because, things are better for us than they have been or, we aren't suffering as much as some other poor sod?!!
I wonder if there is a part in all of us that looks to feel disatisfied and unfulfilled. I guess that's what makes us keep looking for new things. I don't know really. Maybe part of the problem is me and I don't especially want to put in the effort to change!
Still- CTB is frightening so, at least in your world, it would be easier to just hang around till natural death comes along. But there again- death is a problem. We still end up losing the people we love presumably? We can't all live forever- or- can we? In which case- say your great, great, great grandmother has had enough of life and wants out. Her hundreds of grandchildren are still going to miss her though- even if it's what she wants. How do you please everyone? I don't think you can. Things could definitely be a lot better but I'm not sure there is a perfect solution that would suit everyone simultaneously.