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That leaves lenses above 135mm (since there is the great M 135 lens also) and macro lenses.
Why would they buy those kind of lenses if they apparently never wanted them before. If they did need makro and tele they never staid with the M and already used the R system, or now EOS.
So I don't really see a reason why existing M user suddenly gonna buy R lenses.
Revival of R production is an intriguing possibility. Many M users were, indeed, R users - such is the Leica mystique. What killed the R system IMO was the lack of a plausible digital offering (apologies to the R-module fanatics). Now that FF 135 is sprouting out of the woodwork, Leica can either commission a body from Asia and rebrand it, or build their own on the R9 template. Meanwhile, the R lenses are already engineered. M-only users can expand their lens options with macro/tele/zoom from the R side: an option that did not exist in the long period between the end of Visoflex and this new M with LV. Based on price point, image format and AF capability, I don't see any cannibalization of S sales by R.