Again, this has zero impact upon servers that have lockouts for Legacy Characters. Players won't be able to bring characters over until long after people have multiple jobs capped and likely their own handful of Relic weapons.
If you're talking about social impact, that's going to happen regardless of whether charaters exist or not.
And no, again aside for selfish reasonings that should be physically beaten out of people's minds, there's no argument to be had here. It all falls back on this idea that some people with a particular mindset want to force that mindset and its rules on other people. It goes completely against what this game has been pushing for, and more importantly it's bad for gaming in total. We need more options in games not less.
Players want that feeling of continuity in what they do, which is why continuing characters is very important. Denying them that is just going to uninvest them from the game, and speaking buisness, you don't want to do that in a subscription enviroment.