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I was surprised to discover that this does exist - a wealthy acquaintance with a ridiculously flashy mtb (which he rides once a year, on a foreign trip with other, similarly moneyed, once-a-year mtb enthusiasts) casually informed me that "the man" would be coming over to see to his steed. I considered suggesting that he could probably pump up his own tyres, but thought better of it.
I think the future for bike mechanics has to be the self-employed "tradesman with tools in a van" model like for every other thing in your house or garden you pay people to get fixed.
Bring my bike to you? Fuck off it's not a car.