Good luck making SCTP work with the $50 routers that everybody has in their homes. While you're at it, will you convince the rest of the world to switch to IPv6 please?
What has kept SCTP down is the fact that the NAT code would have to be modified to support SCTP connections because they can be multi-homed. That will never happen. So, ironically, once the majority of the world has transitioned to IPv6, SCTP should be theoretically usable to talk to anyone if you're both not behind NAT anymore.