Let's say both fusion, and 100% solar are possible.

To me it looks like 100% solar requires a fundamental change to the way money works. It has to move from being issued on debt (Every promise to pay is a promise to extract), to being issued on energy accepted from donation, since the energy of the sun is pushed to us for free, no extraction needed, money has to be issued for free. We saw a little of this when 4Tn stimulus was issued in US per month.

This is the only way to recover the value of currencies, which have to represent actual product of value, to maintain their value in markets. Until then, inflation will continue to undermine the power of all capital, of which I guess you must have some, to be able to sustain your life living on a boat, with no sources of free money.

When money goes free, to reflect the value of free energy coming in, many industries become irrelevant, such as law enforcement, it is no longer needed in its substantial form, if criminals are essentially being paid to no longer commit crime, and why have tax legislation, if all money is for free, and so on.

Currently, all developed countries are already something like 10% solar powered, there are tens of GigaJoules per second from the sun being put into use in every country.

To finish the job of transitioning to 100% solar power, only an increase of maybe five-fold is required, due to probably half of all money-as-debt industry becoming irrelevant, redundant.

Vietnam has shown us how quickly solar can be scaled up, it is only a matter of a year or two, to make the required change, after funding is made available to do it.

Compare with the development and expense of getting to fusion, it is still something of a dream, to get to actual sustainable power.

Further, since inflation is occuring, for the reasons outlined, large sums of investment put towards causes removed to the future, are becoming increasingly less able to deliver what investors expect. Long term investment is becoming less possible, the more inflation continues to undermine all things.

To me fusion might happen one day, but it will be after we've gone solar powered, for use on spacecraft etc, but realistically, we will never achieve it early enough to pre-empt going 100% solar.