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Dust is a much larger matter for high Mp mirrorless and the coming FF models will have 2.25 the sensor area of APS-C to attract dust onto, so any improvement will indeed be welcomed. The near future holds higher Mp cameras, adding to the sense of urgency.
Dust removal is a major problem for ILC digital cameras used in the field. I suspect this is one factor behind the growing popularity of fixed lens cameras for travel etc., often used in jpeg mode. Merrills, RXs, Fuji, new Leica most likely, more on the way.
Better IBIS will greatly assist high Mp and high density cameras, and now Sony have started to imagine themselves as serious players at the top end of the market, they have a big plus over C/N in IBIS...and so their (and everybody elses' alt) lenses fit better with the new 'smaller/lighter is better' design concept.