Remember there are 2339 TKs in the Legion and only 190 EIB. So at the moment we have reached out to 8% of the Legion's TKs. I know there are people all over the Legion (I see it in my own garrison too) who are one mod away from EIB but just don't want to take the plunge. That's OK in my book because of indirect exposure to the EIB program from garrison mates they are a cut above the Legion base requirements.
Another bonus is that because of the EIB program since it's launch five years ago things like black tube stripes, the over sized and/or miscolored ab buttons, silver detonator decals, and plastic belts are no longer Legion acceptable for new members. Just like all costumes in the Legion the standards are ever evolving. In another five years I could see almost all the EIB requirements being Legion minimum which would make for a bunch of great looking TKs.