If it means a bit of short-term pain for long-term gain, so be it.

However, the short-term pain of being on the other side from the glory days could lead to long-term gain.

See it as short-term pain for long-term gain, perhaps.

Fears of short-term loss can and do deprive us of long-term gain.

If anything, by promoting youth ahead of experience, he has accepted short-term pain in pursuit of long-term gain.