I would never suggest an online MBA to someone who lacks an MD, DO, PharmD, PhD, etc.
However, online MBA programs actually have a unique role for physician executives who don't necessarily need the networking component of a full-time or even executive MBA program. They benefit from:
1. the actual business education
2. the degree after their name
It's a huge time sacrifice for a working physician to enter a full-time MBA program. Executive programs are great, but they offer little flexibility (compared to part-time and online MBA programs). Finally, the key question is: how much will you gain by networking? If you're a seasoned exec and you're already well-connected, then you probably won't have as much to gain when you compare that to the sacrifice associated with a full-time program.