I think they would keep the outfits for a few reasons.
A. The creators probably don't want to have to draw them up new costumes. This wouldn't be the first time they've been lazy.
B. J&J are extremely loyal to TR and probably would want to keep up the tradition of the costumes as a memorial of sorts.
C. The costumes are pretty iconic and the creators might not want to risk ruining the image they've had in place for 15 years.
I can't see them wearing anything else. Even if the organization were to disband, I could see them continuing to wear their uniforms and carrying on their work, as it was very important to them. Wish they'd go back to their black uniforms though