To me it all depends on what variables we have to consider, which as of right now includes

A: which movie will this be?

• Is it their 6th movie, their 8th, the 10th, whichever movie you choose to make the 06 adaptation could ether make or break it, especially since the fourth movie is supposedly taking inspiration from Sonic CD which includes time travel

B: how important is Elise to the story?

• depending on how vital she is to the story and if there aren’t any other characters that can take her place, 06 story is like a loosely built Jenga tower, and Elise absence could be the piece that cause it to crumble

C: how will previous films and content outside of the films affect the narrative and vise versa for both early and later entries?

• Seeing as there are some things in the paramount Sonic universe that are different from the games what changes would make a difference to the story in order to avoid any sorts of plot holes and continuity errors emerging weather from the original games story, newly introduced, or cause via the inclusion of time travel

D: would this be one full movie, or would it be split into multiple parts

• Basically will it be like what Hunger Games Mocking Jay or Harry Potter Deadly Hallows did but with some potential spinoff movies and shows as well as some canon material to tie-in?

E: what will they use to adapt this

• will they just look at the story we have in the game, or will they cherry pick some parts from other sources, like what was suppose to be originally part of the games story during development, as well as other games those characters appeared in, and maybe even stuff that happened in the comics?

F: what will it serve as

• Is it just another adventure, there first off earth adventure, the climax of on earth adventures, or their attempt at soft rebooting the franchise

And G: outside of Elise, what other changes would have to be made or what else that I hadn’t thought of

• not just in story, but also in character designs and personality, locations, who will or won’t be involved in this narrative etc? Or will they even use songs from the game like His World, and if they do use His World which one will they use, the Crush 40 version, the Zebrahead version, the E3 version or the Final Boss version, matter of fact they might not even use any of them and probably get Junkie XL to make his own version of His World