Diploma student here ...
We are fortunate in western PA to have multiple diploma programs that are still going strong, as well as many ADN and BSN programs. All of the 8 diploma programs within 50 miles that I can think of off the top of my head have some arrangement with a local college or university to offer the non-nursing courses as part of the curriculum. So our credits for A&P, nutrition, psych, sociology, micro, a computer class and 2 semesters of college comp (a total of 30 credits) are granted from that college. The faculty for those courses come to our school's facilities, but also teach students in that college's BSN program. Other diploma programs in my area have similar arrangements.
I've researched several RN-BSN programs in my area, because I intend to begin my BSN within a year of graduating from my diploma program this spring. Most will accept my 30 credits for the non-nursing courses, and somewhere around a total of 36 credits for my nursing courses. So I'll be roughly half-way towards a BSN, comparable to an ADN grad.
Our clinical experiences include the 2 hospitals within our system, a Children's Hospital, a state psychiatric facility and multiple community facilities. So by graduation, we've waded our way through at least 4 different computer charting/order systems and "ways of doing things."
For the last few years, roughly 1/3 to 1/2 of our grads have taken jobs within the system, the rest have found employment elsewhere. All have had jobs before graduation.
Obviously, I feel very positive about my educational choice.
But everything depends on the individual program. Do your homework and see exactly what's available in your area. Best of luck to you.