...so they want to be with someone. They are also afraid of the future ("who will take care of me once I get older?")...
That is true! And when they eventually find someone to spend the rest of their life’s with, than they worry about dying this loved one, about abandoning him. We will always worry to be alone, whether you are alone or whether you are in a relationship.
...The couple will still be connected on the inner levels, through their telepathic/clairvoyant senses. In their dreams they will meet on a regular basis...( and yes, they will have sex with each other in the dream world)...
This one is hard to imagine. I guess that’s the future for future generations. Just like you mentioned “it will take decades”. How I see the future as well when it comes to relationships is just like today. I see people holding their smartphones, living in their own world, except instead of smartphones it will be robot, AI or whatever they will call it. People will have relationships with this robotic person. They will fall in love. They will have sex...
It's already happening now. Some couples communicate like this.