Well they made FF3/4 in 3D, I don't see why CT would be an exception.
Still, if it's planned for a US release, it won't be for a while. Plenty of time to save up for a DS. As for backwards compatibility with GBC and older, VisualBoyAdvance is your best bet.
If it isn't, well, that's what ROM hacking is for. There's a few DS emulators out there. Just start looking for CTDS next year online, hack, and translate it.
Although, I understand, easier said than done. CTA is still planned until if the DS US release is announced. If not I have a few ideas in mind.