I haven't gotten mine and I don't look forward to that dilemma. However, what I decided to do is to just take pictures and record video of it showing it's condition and mileage. Then discuss my concerns of the dashboard being cracked during/ after the work with someone as I drop it. For this conversation, video evidence would be cool, but people might object to being recorded, so I'd do secret audio (check your state laws about consent to private recordings). My point is to make it clear that the dash has been OK for 150K miles etc. Even if it comes out ok after the recall, only one recent event would have triggered it to start cracking soon after.
In reality, some here have had their dashboards damaged during the replacement, so I don't doubt something they did could have exacerbated the problem on our already crack-prone dashes; but this could be hard to prove.
I usually don't say this much, but it would be nice for some corporate responsibility on this one beyond replacing the airbags, Just replace the dang dashboard too. Someone screwed the pooch, and would have gotten away with it, had Takata not screwed their pooch too.
Seriously though, what happened to the idea of making dashboards with removable passenger airbags... or good quality dashboards?