My son definitely did not want to go on for a PhD. and didn’t have to with a CMU degree. Many students, especially ones with AP credits do get a Masters Degree where you can do a research project. I’m sure they would be open to a science oriented one if that was of interest.
Actually I think at leasthalf of the CS grads in my son’s class ended up on the west coast and many did internships at the usual suspects there during the summers. My NY kid spent two summers in CA (Internship at NVidea the first summer and Google the second.) and ended up at Google when they made him an offer after the internship. Alot of MIT and CMU kids also end up on Wall Street.