Derek Parfit, on identity, talks about psychological connectedness (examples: recalling memories, continuing to hold a belief or desire, acting on earlier intentions), and continuity, which is the ancestral of connectedness. It sounds like you are saying that commitments should be binding based primarily on connectedness, not on continuity. But this has certain disadvantages. If I take the suggested attitude, I will be a less attractive partner to make deals and commitments with.

(I didn't downvote your comment BTW. But I bet my worries are similar to those of whoever did.)