This game is now 5 years old, and every design flaw in multiplayer is still there and will always be there. There is no reason to suggest we should wait until multiplayer gets fixed to ask for solo content. Since you brought up Shattered Throne, let's use that as an example. Bungie likes to recycle content. Whether it's old exotics that have been taken away to drip feed us in the next expansion, or recycling old enemy types to create new ones (Taken, anyone?), ships, sparrows, armor... a great many things in the game are recycled assets from earlier revisions. That's how Bungie does business. So... do I think revamping old content for solo purposes takes away from multiplayer? No, not at all. I would go further to say it's an easier way to fill content gaps than many other things that could be done, and fleshes out the game at the same time.