As for money maker, car manufactures always have a couple cars that do not make money, so that really is not a reason to say they will not make a new SRT-10 Ram. But, I agree it will probably not happen.
At the same time I also agree they will make a SRT-8 Ram someday, not Dakota, at least in the current form. The current Dakota is not setup to accept a Hemi between the frame rails. The SRT-8 Ram would probably get the 6.4 Hemi, which is also 500HP.
The question is, who is going to take their current SRT Ram and make a GEN IV Ram SRT-10 with a salvaged Viper engine?