Thank you for your input!
I agree that man's role as the dominant lifeform on this planet will be contested as soon as the first super-intelligence comes into existence, there is no question in my mind about that. It's all about how we handle such radical transition which poses an unrivaled evolutionary challenge to us as a species.
I chose to ignore this implication in my article for practical reasons, but I'm happy to discuss it anyway.
If we merged with the entity, as you describe it, the "price" we'd have to pay would not necessarily be an infinite lifespan but rather having to choose the moment of our own death. Maybe at a certain amount of accumulated and stored knowledge and experience an individual will develop a natural, though non-physical "tiredness" from existence? I think we can't anticipate such feeling for which a word has still to be invented. However, personally I can already declare I'd rather "shut myself down" before I'd have to witness the heat death of the universe.
If we decided not to merge with the superior entity, there's not much to discuss. Movies frequently portray superintelligences as curious and marveling at humans but in the real world us fragile meatbags have obviously no utility to them other than matter they can process.