That's the unsolvable problem of what you do with a team that's good enough to get you promotion, but which you suspect is not good enough to survive. Give them the chance to play at the higher level and see what they're made of, or cold-heartedly dump them and start again?
Rather similar to the cry of "he's taken the club as far as he can" which tends to arise whenever a certain manager climbs up yet another level
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I still remember being called up for a rare first team appearance for my hockey club towards the end of one season when they had a chance of promotion. The captain's pre-match team talk basically said we needed to get promotion so the club could recruit better players. He didn't actually say "so I don't need to pick you lot any more", but you could hear him thinking it ......
