The service side could be very lucrative. They get a boatload of money from selling extended warranties, though with the drop in quality, perhaps that is not true any longer. They also get an inside line on selling new appliances to their customers.
But I get the impression that hedge funds don't do so well in businesses that sell predominantly services. they don't seem to have a feel for personal interaction.
I'm sure the techs will be ok, even if they have to go through a job search. There will still be that many appliances out there needing to be fixed, and the skills do transfer to other areas.