Square Enix director Tetsuya Nomura would like to clarify that development of Final Fantasy VII Remake is going well and that the project isn't just now starting up.
During a Dissidia Final Fantasy anniversary event Nomura spoke with Famitsu (Thanks, Siliconera) and cleared up what he believed were some misconceptions about Final Fantasy VII Remake in some parts of the internet. Famitsu asked if Nomura would like to address how because he won't focus on the remake until after Kingdom Hearts 3 that "Final Fantasy VII Remake's development has just begun, or hasn't advanced."
"Yes. That is not official," said Nomura. "As I said during E3, development is going favorably. I just wanted to say that the current PR priority is Kingdom Hearts 3, as it was during the ARTNIA event the other day, but after that it'll be Final Fantasy VIII Remake, so please don't worry.
Nomura said something similar at E3 2018 when the director said that development of Final Fantasy VII was coming along. However, job postings from Square Enix with the stated goal of creating essentially a new game has made Final Fantasy VII remake an ambitious project. And it's still been three years since the remake was officially announced.
Basically while development of Final Fantasy VII Remake is ongoing, it might only be a couple years until we see it, and not a bunch of years.