It's pretty obvious Sony/Square has stashed FF7 remake away as its Get-Out-Of-Jail Card.
They see no need to saturate the market and satiate the insane appetite for FF7 just yet. The day that Sony/Square is in dire financial straits and it looks like they might crumble is the day they'll start work on a FF7 remake. The longer they wait, the more money and fanfare it will be greeted with.
Until then, they can pump out a bunch of other games without nearly as much hype and expectation and basically print money without the burden of worldwide disappointment looming over them.