In the first place jno I expect that there will be a reasonable level of supervision about when and how this procedure is applied. But it's not actually at all the same as "frankenfoods". I suppose the definition of "frankenX" is that X has been in some way genetically tampered with, by splicing small sections of entirely alien DNA into the whole. This is different -- perhaps, only technically, but it's a very important distinction to make. In this procedure the DNA being introduced is human, so already it's not "entirely alien" -- indeed, barely alien at all, or at least no more so than another person's kidney or lungs transplanted to replace damaged organs. Then it's not being spliced into the DNA, being instead a replacement of a separate component of the cell altogether. Mitochondria carry their own DNA but this plays a minimal role in inheritance, as it has very little information in comparison to "normal" DNA.
This whole procedure is just a transplant of damaged for undamaged parts of a cell. That these parts have DNA is a red herring; after all, so does any other part of someone else's body that's transplanted into another person.
There is no reasonable parallel to be drawn, then, with "frankenfoods". Even those aren't necessarily particularly bad, although the safety concerns there are more legitimate. Splicing DNA from an entirely different species into, say, a potato could well have consequences for the natural environment, and more care is needed.