Why do you think quantum computers are going to get that good in the next couple of years? I suspect the odds of that happening are approximately zero.
You asked the question, but don't want to hear the answer.
Advancements are more often logarithmic than geometric: a brief flurry of progress as easy barriers are overcome, followed by a long unsexy slog of incrementalism.
Bitcoin may well be broken someday, but the time scale is on decades, which is well beyond the horizon for high-volatility markets like Bitcoin