You can't postmix from cold storage but anyway, the question is whether UTXOs should be consolidated now into larger UTXO sizes in anticipation of high on-chain fees in the future.

The question really is "do on-chain fees ever become so high that I can not spend or consolidate my 100k UTXOs?" is not a simple one.

You can use this calculator to develop a gut feel: https://bitcoiner.guide/wpfees/

If on-chain fees are 200sats/vB, you can combine 15x100k UTXOs to get a single 1M UTXO, but if the fees go up to 300 sats/vB, you can't do this anymore and need to use more input UTXOs.

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Looking forward to detailed conversation about this.