So here is what I'm picturing, but feel free to interpret the question differently:
1. Person values Ti. Let's say it's a Ti base
2. Person uses Ti to make argument against the existence of Ti
3. Person is convinced of this argument and accepts it
4. Person ceases to value Ti any longer
5. Then what? Person becomes another type? Does their creative become their base now?
And the same pattern, but with other IEs. Is this a thing?
Tbh, I think that step 2 and/or step 3 would be basically impossible for a Ti base; even if such argument could be made, a Ti base would not allow themself to go there because it is too ego dystonic, and the same principle would apply to other IEs as well. Just my guess.