What continues to be written in Obj C? Unlike its C and C++ counterparts, embedded work is not written in Obj C.
I guess your point was "what is the relevance of Obj-C outside of the apple ecosystem?" and the answer to that you already know: pretty much none. But given that the apple ecosystem isn't going anywhere anytime soon, Obj-C will continue to be used for better or worse.
Swift on the other hand will gain all the relevance that Obj-C is losing within this ecosystem and it also has the potential of gaining a lot of relevance outside of apple as well (although it's not there yet).
What is considered soon? 5 years? That is enough to go from Facebook to Myspace.
Claims about Swift seem to neglect the world changing power of Javascript.
This isn’t much an argument, but I find this a hilarious and quite ironic assertion considering the website you’ve put in your profile.