Just look at the other engines and their abilities to release cross-platform productions. You know about Unity. UDK can publish to iOS and Android (although they currently dont support the Android port officially). Esenthel can publish to iOS. Crytek was searching for new programmers with experience in mobile area as iOS. Vision3d just got an iOS port and they are working on more platforms at this time.
As far as I know there are also versions of the Torque engines for iOS.

With all this in mind not only indie developers will release games on phones. Also big publishers will flood this market sooner than later. So I would not wait until 3DGS decides to also starts a port. I would make a game as fast as possible, before the big ones will saturate this market, really, do it now or leave it! Even now it is harder than before, you already need quite some good quality to impress the users.