If you phrase it as "sideloading" then probably not, since it doesn't sound like something they might want to do, it also sounds difficult and technical. If you phrase it as installing your own software then it might garner some interest from the general populace, as who wouldn't want the option to install their desired software.

A lot of people won't even understand the question, because they can install their apps from the app store, because that's where the apps come from, the app store has what phones crave.

Some of them will even be frightened by the question because they consider their devices scary and dangerous enough already.