I mean you can have fun in your free time predicting the end of mammals' life. But what's the point of writing a publication about this? At best, this is going to be completely useless. At worst it's going to be read as: "mammals will go extinct anyways in 250M years, what's the point in reducing carbon footprint now?" Or worse: "look at the crap the government is funding, we should end government funding for scientists".
Plus it's a complete disservice to the word "expert". These guys are true experts in their field and they know a lot of stuff that other people dont, but predictions like this are so random, it's almost certain that these guys are quite wrong. This gives ammunitions to the anti vax and flat earthers saying "experts" don't know shit anyways.
Sorry for the bad feelings, but that kind of research really annoys me. I only see negative outcomes from this kind of studies.