I've done this at for at least a dozen generations without any real degradation in the plant. Just have to keep from stressing out any of the plants to avoid affecting their cuttings. I'm not saying it's not a genuine concern, but chances are you're not screwed if you want to do this a few times. Some strains are interesting, but not good or heavy enough yielders to grow a whole table or justify a big mother plant.cloning a clone of a clone of a clone and so on is not a good idea... You are going to end up with easily stressed plants of questionable potency.