Hi, recent grad of the Georgetown SMP here. The majority of my program's 185 students do not end up at Georgetown, as they only take about 25 of us each year. About 50% of our class who applied this year was accepted to a medical school (whether MD or DO), so you will most likely end up going to school somewhere else. If you do this SMP and have your heart set on Georgetown Med, aim for at least a 3.6 GPA in the program and an MCAT of at least 32 (or new equivalent). Keep in mind that SMPs generally do not offer linkage, so there is no guarantee of acceptance at Georgetown even if you do achieve those stats in the SMP.
The other 50% of the class who were unsuccessful or did not apply during SMP year will apply for the following cycle or will decide that medicine is not for them and pursue other career options (PhD, PA, MPH, etc.). In total, about 85% of the class will matriculate to medical school within 2 years of finishing the program.
GEMS does not grant an automatic "promotion" to MS-2, though students are exempt from re-taking the 3-4 med classes they've already completed (just like the SMP). It's a tiny program with very competitive admission. You may qualify if you have a disadvantaged background, and you don't have to be black or latino to get a fair shot. The thing about GEMS is that it's not a true SMP, and you realistically only get a chance of admission at Georgetown Med. About 75% of GEMS students will be accepted, and I don't know what happens to the others.