This should be in the Suggestions section.
I'm in two minds about this. I like the idea in principle, but if I were to get a character to 50, and make a good build and then things went south and I'd spent maybe a billion on that build, I'd be more than a bit peeved if I couldn't get my stuff back at the very least.
I also think that whilst this may appeal to a tiny minority of players, it would effectively be a ghost town, and already many of the other shards are very low pop.
The amount of work necessary to create this for the practical gains I fear wouldn't be justifiable.