Personally, I can't figure out why they would do such a thing. None are commercially viable at this time. The power requirements are so enormous as to make them impractical until someone finds a way to do cold-fusion in a bottle. Besides, what exactly is wrong with changing the propulsion mechanism? It's still the bullet doing the work. How it gets up to speed should be meaningless. All bullets at this time are propelled in one form or another by expanding gases. So, what if we used electomagnetic forces to store the gas and then released it. Sort of an electromagnetic compressed air rifle...
What the heck is "traditional" anyway? I didn't read the article but... percussion caps weren't traditional at one point and neither was rifling. Centerfire wasn't traditional for that matter neither was rimfire. Bottleneck cases sure weren't traditional... Smokeless powder wasn't either. Everything changes, why fight with it. Not sure we should go with lasers for killing game but then again the end effect is the same as a .50 round ball and black powder.
NGH