So, you have a choice between a top-quality pre-professional program, and a top-quality liberal arts program. Spinning this choice as a question of “readiness” makes it sound as if laying a broader liberal arts foundation were somehow a remedial option.
IMHO, your apparent gut preference for a more intimate community that’s collectively pursuing more of a “Renaissance person” style undergraduate education is not primarily about not being ready for the more pre-professional university setting. It’s about recognizing that while the profession of journalism will be there (well, there are some who question that, but dystopian projections are beyond the scope of this thread, lol), and a specific education in that field can be pursued at the graduate level, the offer to spend four years in an undergraduate-focused liberal arts setting will not come again. Not wanting to pass that up is not a matter of “readiness,” at least not entirely.
What could be construed as a matter of readiness is the aspect of narrowing down your education to a pre-professional one in a specialty area. Indeed, many 18-year-olds are not “ready” to constrain their options so quickly. Some young people are clear on a professional path and are ready to be done with broader academic exploration, and that is fine. Others want or need to go wider and deeper in their academic background, either in order to get clarity about their chosen path, or just in order to set that path in a broader intellectual perspective. That’s fine too.
Financials also come into play. If you’re under significant financial pressure and would have difficulty affording a graduate program in journalism after Carleton, then there could be a “now or never” aspect to what Northwestern is offering you, as well. A four-year liberal arts education is to some extent a luxury - you’d be spending your time and money to take a less direct path to a career. If both choices are financially feasible, then it’s about what you value - it’s quite possible to be “ready” for one thing and still to place higher priority on another.
I’m not specifically familiar with how much elective time you’d have, in the NU journalism program. Perhaps there is time built in to cover a lot of liberal arts bases. (For my daughter, the choice between a LAC and a pre-professional university program was more stark - the free electives could be counted on one hand, with fingers left over. Ultimately that felt too narrow, too soon. Which… I guess “not being ready” is one way to look at that. But you know… life and education don’t always need to be a race.) No matter how much you value liberal arts breadth, though, you will still be in a far more preprofessionally-oriented peer group at Northwestern, vs. a more “life of the mind”-oriented peer group at Carleton. (Of course there will be overlap, and both values are represented at both schools - I’m just talking about which mindset is more strongly represented.)
I know several Carleton students who are involved in journalism pursuits, including both the student newspaper and outside internships. They’ve had great experiences and no shortage of opportunities, but one could not equate those experiences to what you’d get in full-blown journalism program like Medill. There’s definitely going to be a “road not taken” here, however you slice it. Ask yourself which opportunity you are more willing to give up. And, looking at what you’re giving up with each option, also ask yourself how you could best reclaim the aspects you most value in the path you’d be foregoing. Go to Carleton, get involved in student journalism, pursue internships, summer intensives, grad program…? Go to Northwestern and be deliberate about seeking out LAC-like experiences, whether through a double-major, study abroad, summer programs, residential communities…? You can tilt either experience toward the other, and meet the less-optimized needs in other ways, but the fundamental character of the experiences will still be distinct. Give some thought to how you could best cover the bases that matter to you, at each school, and then assess what would still be missing from each. Congratulations on having two enviable options - it’s a tough call but hopefully you can find clarity about which is right for you.