The size thing is obviously untrue, just a wee bit of compression should do it.
Methinks it could be a case of "But they've all got ScummVM already, why would they buy it?"
To do it properly, not only do they have to rewrite Scumm from scratch for the DS (At which point, why bother, why not actually just license ScummVM!), but they might as well then carry on, and write some new games..
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