I think it's the mining that's most relevant here. If these things were set to work mining, they could take the vast majority of the remaining amount and thus create a controlling stake very quickly. All mineable coins, not just bitcoin. Worrying times ahead in that respect.
However, as for the development of Quantum computers which are so finickity to run at their maximum efficiency error free, it reminds me of the time we were developing fibre optics which was so dependent on the interfacing of the fibres with the terminal translating equipment as well as the jointing of the fibres to create their most efficient results
In the early days we were losing 90% of the capacity but as time went on, more accurate terminations and splicing was possible thus vastly improving the bandwidth which was already hugely superior to copper transmissions.
Quantum computing has the theory and practical basics in place but still a long, long way off replacing your i7 I think :-)
Interesting few years to come though!