Stop. Right. There. Unlike so many other major dramas of its era and later, L&O isn't about stunts and couples and tearjerking, it's all about the business of solving crimes. It should just end with a solid regular episode.
Agreed. L&O is a show in the vein of the episodic dramas of decades past, and those almost never had any kind of finale. There's no arc to the series; hell, it's practically an anthology with essentially interchangeable characters. It should end in a way that's true to itself: another case, another trial, another day on the job.