A movie focused on Snake Eyes as a character means, quite bluntly, that the film probably won’t feel like a G.I. Joe movie in the way that we think of it, and that’s actually a good thing here.
And if the Snake Eyes movie works, you can reintroduce this new version of the character into a more traditional G.I. Joe movie, and fans will go along with it.
A movie based on pretty much any other G.I. Joe character will instantly feel like more of a sequel to the other movies, and that’s not useful right now.
Either way, the baggage of a couple of mediocre movies will hang less on a Snake Eyes movie than any other.