I'd argue that it would be a severe stretch too that the only thing preventing people from subbing is an "even more pretty race" then (Viera).
But that's not really important point to me (not a great point to argue against viera for lol). I believe SE getting new blood is an important resource to tap, because they can then get them into the sub cycle and cash shop cycle. Vs people who would already be buying cash shop and paying their sub. This is why I suggested they might be gender locking on two races rather than making one full "pretty" race though. Here they keep people in the cash shop cycle and subbing/buying expansion for that and then also drawing in new blood because SE has a void when it comes to "weird" (imo).
Also it depends on if you count dwarves, gnomes, and dranei as weird or not. Imo they are weirder than FFXIV's but you may or may not consider them. Either way you get 36%+ or 49% if you count them. That's a pretty good number either way.
36% (or more depending on how you count it) of a group you're not addressing at all is a lot when you consider the other 70% you are addressing very well (FFXIV is loaded with pretty already).
Although I wouldn't suggest that if WoW refugees is why they're going this route is the only reason why. I'd also say its because FFXIV already has a bunch of pretty races, so not just for WoW but for other players who are not represented at all. Adding a race to a void that exists vs adding a race to a very bountiful area.
That doesn't mean people wont switch to it (Viera), I'm sure there will be loads of fantasia money, but it does mean that there is an audience that isn't represented and possibly able to bring in new blood or make FFXIV a better home than before as they weren't represented. Au Ra concept art I think could have met that, but the current Au Ra.. I really don't agree that they're weird, especially the females lol.
To add I'm not saying I want them to bar adding male Viera because of this. I'm just saying that addressing the void, addressing the refugee leak of players who don't have an equivalent race (we have blood elf/night elf equivalent), and also adding more pretty (Viera female), could be a legitimate albeit annoying game plan.
Adding both genders to two very visually different races would be the "epic" game plan.