These days Final Fantasy is far from turn-based with its real-time combat in an open world. Now that consoles can handle the combat inside the main environment there is less of a reason to wait for a new environment to be entered. Further, in their recent desire to reach out to newer players, the old system may seem too slow for gamers accustomed to the fast-paced games of this decade.
The result of a different gaming generation creates a schism in the fan base and a large decision for Square Enix: choosing which combat system to adopt in the remake of their classic title. With numerous alterations made over the years, there are many options, but usually remakes are modernized in small facets rather than a complete overhaul in an important mechanic.
Luckily, for those in question, there are only a few options Square-Enix would consider.
Final Fantasy VII Active Time Turn-Based
Regardless of it being the original way combat was delivered, this may not be the best choice for a realistic PS4 game due to it being replaced by a more modern system by the time of Final Fantasy X, the first PS2 release. While this option is one we hope for, we expect a more fleshed out update to the system or something completely different.
Final Fantasy X Turn-Based
This made the player have to consider who to use and when which essentially added a new layer of strategy to the game. Further, spells effect the order and could aid in giving characters more turns (or vice versa). Being released quite awhile after Final Fantasy VII, taking the combat from this game would not provide older players the nostalgia that the original turn-based combat did, but it would feel more similar than the most current approach.
Final Fantasy XV Active Battle
This modern approach not only looks cool, but plays very smooth as it feels much more fluid and modern than watching the characters do preset attacks.
In addition, it adds a degree of flexibility and possibility into what can be done and how. Altogether, this seems like the optimal choice to enjoy any realistic game in, but it can not be for sure until Square Enix makes a statement.
The upcoming Final Fantasy VII remake for PS4 would function best with the most recent battle system, but it may upset the older fans. If Square Enix were playing it completely safe they could attempt to give the players an option as to which method they wish to fight in, but that may be a long stretch.
Currently, it looks like the game would do best with the Final Fantasy XV combat system or an altered, customized version of that system to best fit Final Fantasy VII. Some older fans may be disappointed at first, but after experiencing one of the most popular Final Fantasy games' story in today's graphics they would probably overlook any nostalgia that could perhaps be jeopardized .