Which anime absolutely NEEDS a modern remake/reboot?

@TheMechaManiac I started watching all of Gundam because of Witch from Mercury. I quite liked Mobile Suit Gundam for what it was. It was a bit meandering and doesn't really have an ending, but the appeal is quite clear, and I could see exactly what ideas from it had carried down through the years all the way to G-Witch. I really disliked watching Zeta though. I'm currently up to ZZ which I'm rather enjoying. Obviously I may not actually enjoy them when I actually get to it in several years, but I think the Gundam SEED and Gundam 00 idea of reapproaching the same sort of premises of prior series with a modern lens suits a futurist franchise like Gundam far more than the idea of just remaking bits of it. People shouldn't have to like things to be able to appreciate their contributions to a medium or genre anyway.