yea well, it if did come to PS4, some would play it
Honestly mate, they should do what they did with SF 3rd Strike Online and try to make it as arcade perfect as possible. If it gains enough interest they can make a new and shinier game later down the track. I don't see the point of all of that effort to essentially remake an old game from scratch unless they're changing so many elements that they're making it into it's own new game.
Here's a good example of why I hold those opinions. Look at Ultra SF II, a prime example, which is the spiritual successor to SFIITHD. The developers basically remake the graphical component of the game "Udon" style, which has now been canonised as the official art style of the series. Then what happens? The fans that are still there (who are niche, hardcore SFII fans) aren't interested, they want to play the game in its original form, due to the "new graphics" having issues with being Arcade-and/or-"frame perfect" which apparently the old graphics don't suffer from. Barely anybody plays with the new graphics, so although it looks great in marketing and box-art, it's essentially a waste of time. If they didn't offer the new graphics, any associated art/ box-art essentially becomes inconsistent with the final product. There's also something else, if you create a physical release, the distribution costs, the physical box and disc cost, etc. Essentially the costs will be much higher for a game that's anywhere between 10-20 odd years old, who people are going to buy to only really play either:
- Online,
- With siblings/ friends, or
- Competitively
With online being the majority, more than likely. When trying to reinvigorate an interest in an old series, unless an anthology or collectors edition with a lot of extras is being released, it's smarter to either release the games via network stores, release via steam, or both. Because the hardcore fans still want it, they will buy it regardless. if the cost is right (which it will be more inclined to be if it's DLC only) this may attract newcomers.
Sidenote: The only problem I really see with an online release (perhaps this is more of a geographical issue) is that it's expensive and in some cases it's cheaper to buy physical media, which puts a cruel twist of irony on the whole situation.