The role is a decent start towards working in consulting. I'd expect you have the opportunity to develop skills that you transfer into a consulting role. That might be of more help to you than the Six Sigma detail knowledge, unless you want to become a Six Sigma specialist. Of course, if you do, then this is also an option open to you but not normally you'd pursue as a specialism until you have some years of experience working with the toolkit and several implementions.
Personally, I don't think Six Sigma will be more than a niche operations toolkit - it is currently on a peak but that may not last the years it takes to develop into Black Belt roles and gain significant experience. However, the general process mapping, project management, etc. experience that you gain in project support can be transferred to other operations improvement work.