Nah - think about this:
1) at Ethicon - when we do labs - who do we bring in - Docs who are our customers and we have good relationships with! Would they say good things about our new Ethicon device to other reps - sure they would - they are not about to give up the chance of getting invited to another lab by talking smack about us. These docs make some nice coin for participating in those animal labs.
2) It take almost 2-3 years before a new device with a hardware component gains any traction in the med device market for several reasons: a) getting a budget strapped hospital to buy another technology that does pretty much the same thing as your existing technology is difficult to impossible. Once you have the contract - let's say they kicked their Ethicon stuff to the curb (not likely, but for arguments sake let's run with it), it will take time to train up the docs, nurses and staff to use - and clean! - the device.
b) Now you are dealing with the grumbling of docs who have been using Ethicon forever and are having a hard time do delicate work with a device that basically has all of its weight in the handle requiring the docs wrist to support the weight (grip, grip, grip) while remaining relaxed enough to permit fine motor movement. Yeah - it will be fun watching that.... and now docs will either go to manual dissection and LigaSure for sealingn(not likely if they are die hard Harmonic users) or throw a fit and demand their Harmonic back.
Reality - docs that are hardcore LigaSure users will have Sonicision to add to their tool box. Docs that use LigaSure for major vessel sealing and Harmonic for fast tissue work will keep using both. Hardcore Harmonic users will stay with Harmonic. And Gyrus users will keep frying the crap out of their patient's vessels and BBQing the surrounding tissue. Life goes on....