Umm... no. I'd guess GW agrees w/ me that people you've shadowed probably aren't good people to have recommend you for medical school.
Also, shadowing is not "experience in the field." It's "watching someone else have experience in the field." In other words, it's only slightly better than watching Grey's Anatomy (which is absolutely worthless). Sure, shadowing is often looked upon as a requirement but we're really talking about 40-60 hrs max spread amongst a variety of docs. The fact that you are stuck on this "shadow 1-2 yrs" thing tells me you're completely missing the point.
If you want an MD's recommendation, work with one. That may be clinical experience (free clinic, scribe, EMS, etc.) or some other volunteer work where a doc happens to be. Shadowing 1, 2, or 10 yrs w/ the same doc makes zero difference. Now if you're scribing, that's a different story. As a scribe, the doc sees things he can comment on (e.g., your bedside manner when the pt talks to you; your organizational skills; your listening; your speed and ability to think on your feet; your willingness to go out of your way to assist others; etc.). As a shadow, however, you have ZERO responsibility. You are less useful than the mop in the closet when it comes to patient care.
Do you honestly think a doc you shadowed for a few weeks can give such a frank and fair assessment of you to a med school that it would separate you from the rest of the pack? Even if the doc wrote a stellar letter, don't you think the school would consider it with a VERY large grain of salt when the reviewer reads the "about the writer" section of the LOR (i.e., the part where the writer states his/her relationship to you and qualifications for recommending you)? In other words, a letter from a doc you shadowed is something for the shredder. It is far more valuable as kindling for a campfire than it is as an LOR.