What - there's more to life than "mobile apps"?
"Plenty of pundits have suggested that containers stand a good chance of killing virtual machines, citing the former as lighter, faster and better-suited to building the kind of apps that work well at scale on the web and with mobile devices."
Perhaps "replacing virtual machines for one specific use-case" might be a better way to put it, unless said pundits really think that the only use for virtual machines is to build web sites and mobile application back ends.