That seems unlikely, especially with the free trial in place. There's ample time to try and wait and see and potentially warm up to the idea of playing with others.

These updates aren't being done solely to appeal to a few single player folks, but also make the game easier for anyone to enter and get comfortable with.

PS Plus for multiplay is there because someone has to pay for those servers. XIV is only playable online. There's no way to really have a full single player experience because you're definitely going to run into people and interact with them in someway, including by way of the marketboard.