"I am looking forward to a future where the cities will be under a self-sustainable 'dome' and everything between those cities will be wilderness/jungle, we will let nature take over."

This strikes me as a similar idea to 1970s sci-fi with its "arcology" super high-rise vertical cities.

It hasn't happened yet because it makes too much sense but isn't a solution that makes the most $$$/humanity is far too selfish.

Hope I'm wrong but I don't think you'll live to see your dome :(