Unfortunately, it's not that it's not impossible for us to develop Final Fantasy 7 for mobile. It's that currently, space will be an issue. Phones won't be able to contain the space it takes. It's over a gigabyte. People are probably going to have to wait a few years.
I feel like creating things without getting too hung up on little details, and paying more attention to the importance to the concept itself, is the way to move forward.