This is a tough call now. On one hand, your early years 18-22 will be even more of a grind. On the other, med school admissions has gotten insanely competitive. I'm sure BS/MD won't be all bad in terms of rigor, and that you can still make time for fun, but I still don't think that most 18 year olds are able to handle it. Yes, that's how they do it in many other countries, but I don't know how well they fare, and many things about healthcare and general life are very different in America.
Another issue is if you do make it through, and you feel like you didn't have fun ages 18-22, you'll probably burn out. For various reasons, my 18-22 years weren't super great, but I still had a lot of fun experiences outside the classroom when I finally decided to make my social/personal life a priority. I will be matriculating to an MD program in July or August, and I did very well in undergrad.
I'd imagine these programs have had a 50% attrition rate all over the country. Honestly I think that's going to increase. My brother is in that age range, and from what I see in his social circle, social media, fortnite, soundcloud rap, binge drinking, etc has dumbed a lot of them down. I'm not trying to be on a moral high horse here, but I think that kids nowadays have taken in all these things in excess.