Does that analysis factor in fusion eventually becoming economically viable or not?
My understanding is that progress with the stellerator has been very slow. I did hear something a few months ago about a breakthrough with conventional tokamak technology, but nothing since. I guess like some here with regard to quantum computing, I'm not holding my breath. Were someone to demonstrate actual over unity containment with a roadmap to commodification it might be time to reassess, but there remains the density problem. The energy density of a litre of unleaded is pretty astounding.
As to the idea that fusion will "solve" any problems, I am dubious. Humans have a near perfect track record of abject stupidity. All of our advances in energy transmutation, from steam to internal combustion to nuclear, have simply allowed us to do more bad things; more sprawling environmental destruction, larger wars... Frankly, a South American or African peasant with a Mr.Fusion and a goat is a terrifying prospect.
There is no density problem at all.
Fusion is estimated to be around 10 million times more efficient as classic fossil energy.
Basically it looks like this:
Fossil x1 million ~= nuclear fission x 10 ~= nuclear fusion x100 ~= matter/antimatter annihilation
Regarding the second part:
Would you rather live in the stoneage?
I mean with fusion energy abudant we will be able to colonize space and at least have an exit strategy in case our earth is destroyed.