>>149140701
Part of it is that the execs running companies are still Gen Xers
Nick/Viacom mainly has been buying up these properties that were big at a certain point so they can merchandise them under Nick branding. TMNT87 was a big phenomenon and they want to make people think Nick was behind it. It was long enough ago that they can play with people's shaky nostalgic memories and make them think it was legitimately a Nick show. Ignoring 2k3 also makes their first Nick show seem more important as a revival of the series.