I can understand waiting on an EV, but why wait on solar? An EPA subsidized "energy efficiency" loan will cover the cost of the installation, with a payment lower than your power bill. You save money immediately and break even in ~7 years.
I had solar panels installed a little over ten years ago, for environmental reasons, and I was surprised to learn that the economics were already good enough to make it work out as a benefit in purely financial terms. Equipment has only gotten better since then.
There are a ton of factors that go into making solar a sound decision.
Will the person plan on living there for the next 5-10 years? Will installation costs finally start falling three years from now? Will the government institute a large grid connection fee so as to significantly impact payback periods? Is the roof going to need replacement within the next 10 years?
I had solar panels installed a little over ten years ago, for environmental reasons, and I was surprised to learn that the economics were already good enough to make it work out as a benefit in purely financial terms. Equipment has only gotten better since then.