Okay, I know HBD isn't going to just start opening up new worlds, so this is just an idea I had that might be fun.
What if there were two or three worlds all linked together, with the same 32 owners, to form one "interdimensional mega-world"?
How it would work is it would be perfectly acceptable to trade player A in world A for player B in world B...in other words, you could send a superstar to another team in exchange for a scrub in world A, and get back a stud prospect or two in world B in exchange for a scrub. Or even trades involving multiple teams over all three worlds could be possible.
The world would take some getting used to, and everyone involved would need to be prepared for a learning curve, but it would be a unique challenge for those who feel there isn't much more challenge left for them in HBD.
It sounds like a fun idea to me; I'm sure I will now get ripped apart with every possible negative comment anybody can come up with.