Looking forward to detailed conversation about this.
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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