It only goes back to WoW for those who have played WoW. It's natural for people to compare things they have experienced. Those who never played WoW have no experience to compare to.
I played WoW for 7 years before I tried FFXIV for the first time. I continued to play WoW for about 4 years, switching back and forth between it and FFXIV before I threw in the towel on WoW and its borrowed power systems, forced grinds and ARPG style loot RNG.
This game doesn't exist to fight WoW. It exists to offer its own gaming experience. For some, that overall experience is better than what they get from WoW. For others, WoW is better. For yet a third group, both games are fun in their own way and they play both.
Strangely, by saying that fewer people would be playing FFXIV if it weren't for WoW you're handing FFXIV a complement. A subpar game wouldn't be able to draw players away from the legendary King of the Mountain and hold their attention for years.
My opinion is that is an extremely unhealthy thing to want, both for the gaming industry and for personal health (you're calling addiction a good thing).
Part of what makes this game different is that YoshiP was a gamer long before he ended up on FFXIV or even his pre-FFXIV days on Dragon Quest. He understands the value of having the freedom to play and experience multiple games. He's passed that freedom along to the player base with the FFXIV design. We're not overloaded with grinds to accomplish each week (or indefinitely) so we can play other games concurrently with FFXIV. If we want to take a full break from FFXIV for a few months, it's easy to play catch up once we return.
Since I know at this point someone is going to go "housing", I'm going to call it what it is - a personal problem. It's up to the player to decide what is more valuable to them - the house or their subscription money.