Legacy Format

I've been thinking about the release of a new format for burst, the Legacy Format.
This format would be based on older parts, wich nowadays are useless for competitive play, this parts for now, would be any part released before V2, the Single Layer System, of course, pieces as for example, Xtreme, wich was originally released with Xcalibur, would be legal to use their versions released on further systems as the Xtreme that came with O2.
Tell me what you think!