Before I begin, I have not read all of the (as of this writing) 90 comments on this topic, so forgive me if I bring up anything that has already been addressed.
I agree with MovieBob’s choices on video games more or less, though Bayonetta seems like an odd choice to me. I must point out, however, that saying Chrono Trigger is a game that can be adapted into a big-budget movie is unbelievably wishful thinking. Don’t get me wrong; I loved playing Chrono Trigger. I played enough to see every ending (sans any added in the DS remake, which I hope to play someday). However, besides the reams of scenes that would need to be cut in order to make the running time of a Chrono Trigger film reasonable, the biggest problem with adapting this game into a movie can be summed up in one word: marketability.
There is an absolutely astronomical amount of weirdness, including, but not limited to, an anthropomorphic frog knight named Frog and a pudgy yellow robot named Robo, that an average American moviegoer would need to swallow in order to watch this hypothetical film, but in an attempt to make my point succinctly, let us turn our attention to Crono, the game’s protagonist. To start off on a messy note, he has distinctly “anime” hair, and Crayola-red anime hair at that. The two most iconic colors of his signature outfit are baby(-ish) blue and bright yellow. His home is a marginally modernized Medieval Europe, yet he wields a katana. And did MovieBob even consider the dilemma of Crono’s muteness? Putting the game on the big screen would necessitate Crono talking, and no matter how Hollywood would handle that, there would at least be a small number of really pissed fans. The icing on the proverbial cake, however, is that even with all of this stuff that could easily dissuade a casual viewer, all of the other oddities in the Chrono Trigger world make this guy seem normal. In short, trying to take all of the absurd happenings and characters in Chrono Trigger and play them straight in a movie would result in a huge flop that could only aspire to be a classic among fans.
Changing Chrono Trigger for the sake of the uninitiated is also not an option. The absurdity, oddball humor juxtaposed by dramatic confrontations, and iconic characters are at least part of what made Chrono Trigger so memorable in the first place. To change the world of this game so that it is more “realistic” or generally acceptable by movie standards would alienate fans and damage, if not destroy, the charm of the original license. In fact, I am of the opinion that it would require more effort to alter Chrono Trigger into something resembling a marketable movie than it would to create an entirely original concept. If the screenwriters try to keep elements of the original while adapting it for an average audience, the result will be a repeat of the abominable Dragon Ball: Evolution.
In conclusion, despite what MovieBob might think, a film adaptation of Chrono Trigger can only end in disaster.