Plausible and difficult. The difficulty doesn't really lie in WHERE you are attempting transfer from, but rather in the fact that most schools don't accept transfers at ALL, or place such severe restrictions on them that most applicants cannot met the requirements.
Schools may require you to have a significant other on faculty or as a current student, be a state citizen, be from a LCME accredited school (which obviously leaves out all IMGs), etc. In addition, schools that might entertain the idea of accepting a transfer have to have a spot - this often means losing a student through attrition - failure, transfer, or death. This doesn't happen very often. Most schools which will accept transfers will be private colleges of medicine. However, you will never know unless you try, so I would encourage you to research your options and give it a shot if you consider yourself a satisfactory candidate for transfer.
Best of luck.