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If computational tech cannot be miniaturized then it is dead, as only at massive production quotas does the technology become useful enough to become inexpensive. This is exactly what happened with normal (non quantum) computers. Imagine if computers were still the size of a room... Terrifying thought

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You're right that it does need to be miniturized to some extent but there's absolutely no need for it to be desktop sized. If in the future a quantum computer is built, taking up multiple rooms is not an issue at all.

The value is in a quantum computer existing at all, not it's availablity to consumers.

Miniaturization really kicked up because we needed to shoot computers into orbit and minimizing mass was a crucial optimization for that problem.

Might see a similar bout of miniaturization if we can come up with a good defensive/offensive application for putting quantum computers in orbit.

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