Maybe if it was 2001 and contracts didn't come into play like they do now. Bulk of business would still stay secure because of GPO contracts in place. Sure, you may lose a few surgeons but to think that you are going to lose all of the business is unrealistic.
Think about it, let's say a division has a bunch of senior and exec reps that are making anywhere from $150-$200K a year and you replace them with $80K techs, even if you lose $100K per territory because of a competitor, you're still breaking even because you lost the compensation overhead.
Also, say a GPO swings towards us and you have an $80K tech running the conversion. They aren't going to see a huge swing in their compensation because they are at a fixed salary. That additional compensation or growth goes right back to the mother ship.
I think we would all like to think that we are irreplaceable and that all of the business would be lost if we left but it isn't true. I've been here long enough to see good reps leave with little disruption to their business after they left and until a new rep enters that market.