There's always a change - be it 0.002% chance or 99.99% chance! Is it likely? I don't know if it is and why it hasn't been kept as a series.
Similarly the Vet worlds or slightly changed Vet worlds seem to have stopped. Some of the settings on a Vet world would be interesting if transferred to a special world. One idea - POI's that have hubs. Control a POI by controlling the 8 surround terminals with the Forgotten fighting back with a short timer to get out of the way. Short would be 14-18 hours - so regular login would be required (or subs to an online player).
Or a time limit on how long you can control a POI of 1 -2 weeks. Regular movement would be then required.
A speedworld setting would need to be sufficiently different from regular Wrath and Tiberium ones - but how to speed up progress, I'm not sure. One way may be to increase the cp gain per hour to 20 (as has been done on the current PTE). Another maybe to increase the output from acc/power combinations.