You burn a barrel of oil once. A solar panel lasts for 20+ years. After you have installed it, if China announces they will no longer sell new ones - you have two decades of lead time to start building your own domestically.
Either the panels are purchased piecemeal, in which case some have to be replaced every year as your rolling stock fail, or they're replaced in large batches - which would be incredibly predictable, suggesting China would not fill one massive order and then say "No more", assuming they're trying to inflict pain
Either way though, you don't have 20 years to get up to speed.
They have 25 year warranty with performance guarantee of 92%. After 25 years, it will continue to work fine, 8% lower output is perfectly acceptable. Most likely will last 50 years or more.
There is no product on the planet that has a a multi decade warranty with this kind of performance guarantee.
