You're failing to consider any number of reasons this wouldn't fix the problem:
1. Future-value discounting. Even an immortal may well value present experiences over future ones.
2. Consolidation of power. There's little evidence that any system based on perpetuities won't result in the accumulation of wealth and/or power in a limited set of hands.
3. Strategic intentional long-term power consolidation. If you live forever, you'll be concerned forever about upstarts seeking to claim / disrupt your space / power base.
1. Future-value discounting. Even an immortal may well value present experiences over future ones.
2. Consolidation of power. There's little evidence that any system based on perpetuities won't result in the accumulation of wealth and/or power in a limited set of hands.
3. Strategic intentional long-term power consolidation. If you live forever, you'll be concerned forever about upstarts seeking to claim / disrupt your space / power base.