While it is true that 1.2x players did indeed lend great support to the hype of 2.0, you're forgetting some details.
1: Final Fantasy is one of the world's most loved gaming franchises and it's over 20 years old. Its fanbase is huge. 1.2x and 2.0 weren't obscure games. A lot of fans who had not played yet were waiting for 2.0 because it was essentially a new FF game to play, and also anyone who didn't have a pc would finally have a new FF mmo they could play. Anyone who loved the FF series knew about XIV. SE's fame certainly carried them to a degree.
2: SE dismantling their latest mmo and building a new one from the ashes very quickly gained legendary status among the mmo community. Attempting such a thing was almost unheard of, and certainly the success of something to this degree never happened before. Five years later XIV is still the only mmo to accomplish success with anything like this. I personally know people who never played a FF game who were very curious about XIV because of this, and they bought 2.0.
3: SE had no choice but to make 2.0. 1.0's ill-fated release nearly destroyed SE. It truly looked like one of the mightiest jrpg kings would be dethroned. The only way to convince their fans and their shareholders that they could make a solid mmo was to...well, make a solid mmo. Especially to their shareholders because they invested their money into the project and it flopped, so they lost money. That's an incredible amount of financial pressure. SE simply could not leave XIV behind and hope to recover from it, because they wouldn't have survived.
4: SE created their own hype by doing a 180 by becoming hugely involved with the playerbase. Players feeling like they truly had impact on the state of the game definitely inspired them to play more, and be more constructive and active with their feedback. And this resulted in the point you brought up: the 1.2x players helping with 2.0.
1.2x's players were instrumental in not only creating hype for 2.0, but also for the sort of game 2.0 ended up being due to feedback. But let's not pretend that they were the only important factor. SE's long time fame, great reputation and the risk of ruin was equally important.
What rumours? 1.2x is a different game to 2.0 because most players, as well as most developers in Yoshida's team did not think 1.2x was good enough, and from a technical point of view it was horrible to work with to the point it severely lacked longevity. This is not an opinion. This is fact. If the "rumours" weren't true then 2.0 would have been an expansion and not a reincarnation of XIV.
Sorry but you liking something doesn't automatically mean it was better in every way. You liking 1.2x doesn't change that the game was unstable, it doesn't change that most players wanted something more or different, and it doesn't change that it was a nightmare for the devs to work on it.
You are truly mixing up fact with personal taste. They are not the same thing. I don't think you could even be called a white knight. You're too blind to wield a weapon.