-Teleportation (slurl / sansar url)
All those things, if they were integrated in common between your 2 systems, (SL and Sansar)
could contribute to bringing more people to Sansar.
Right now, people from SL won't even go to Sansar, because they won't leave their friends behind.
Instead of having those 2 systems isolated, they would become complementary, even if the virtual goods are not compatible.