I'm sure everyone would be completely fine. It's the first year of a degree, it's made for settling into tertiary lifestyle. In fact, they would probably be less 'shocked' going in than the people coming in fresh from high school because they already have some breadths to credit (therefore take less subjects) and they are already integrated into uni life. You really shouldn't imply that people in Commerce have an easy lifestyle - there are many people studying Commerce who probably work just as frequently and hard as you or I. You can invest effort and time into any degree.
Nobody choosing Biomedicine is 'insane' but potential valid reasons to not choose Biomed could be: I want to have more freedom of choice in my degree regarding electives, I'm not interested in a Biomedical major, I'm not interested in taking Biomedicine cores. Not 'I want to be more lazy'. You have to think of the benefits of completing x degree rather than how 'hard' it might seem for you to do so at the time. If the OP's friend wants to transfer, let them transfer! Three years of 'struggle' will be forgotten if they get to study what they're actually going to enjoy and get a job or a postgrad place out of it in the end.
To be fair, my original quote did sound overly pompous and wasn't particularly well thought out! You're quite right that anybody can work hard in the degree. I was acknowledging the everyday student, something that is very potentially incorrect! Biomed is more of a committment in terms of passing. There are more contact hours, and extremely frequent assessments. Doing well is relative though, you're quite right when you say that it's essentially the same for each degree.
I still stand by a degree of insanity about moving into Biomed. Though I do say it lightheartedly. Biomed is massively competitive. If you don't do well, there's precious else you can do. At least with commerce there seems to be (based on the Uni's constant sprucing of graduate outcomes) ample opportunity to find employment. It's just a huge commitment and can be very stressful moving into that lifestyle. No doubt at the high ends of commerce it's extremely stressful as well, something I don't deny.
In all honesty, I hate that perception of biomed snobbery, which I'm sure my previous comment roused in everyone! There certainly are some of us who, how shall we say?, don't try to stop it perhaps? haha
But by all means, go for it. The choice really has to be about what you want to do with yourself and what you enjoy studying. No matters the competitive lifestyle of the course, or the relative difficulty, you're always going to do better when you're enjoying it!
I hope a touch of seriousness has qualified some of my cheek!