A long time ago, I had independently thought of the same basic strategy i.e. conditioning T-cells, which are normally very good at killing diseased cells, to specifically target and kill cancer cells.
Now there are signs that an effective way of doing this might be developed by 2020.
I just hope this will not just be like the vast majority of initially very hopeful-looking cancer research in the past i.e. destined to fail miserably to lead to any effective treatments worthy of mention.
But, IF this does work, I really think we could be talking here about a cure!