The longer they wait to make such a statement, the cheaper it becomes (due to more cars being taken off the road, or sold 2nd/3rd/4th hand to new owners who don't care).
At that point, they can decide if it's cheaper to settle all the lawsuits and refund all the angry owners, or if it's worth making an upgrade adapter to fit HW4/5 into the slot designed for HW3.
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The longer they wait to make such a statement, the cheaper it becomes (due to more cars being taken off the road, or sold 2nd/3rd/4th hand to new owners who don't care).
At that point, they can decide if it's cheaper to settle all the lawsuits and refund all the angry owners, or if it's worth making an upgrade adapter to fit HW4/5 into the slot designed for HW3.