I don't think it's possible for most people to make this a one-pass activity without it causing a lot of friction for them, but over time you can build a critic

I don't think it's possible for most people to make this a one-pass activity without it causing a lot of friction for them, but over time you can build a critical mass of your social circle on non-FB platforms that allow you to _then_ delete WhatsApp with less friction. Step 1 for family & friends is being available on multiple platforms, because that in turn gives _their_ circle less tie-in to WhatsApp. It's only when their circle also make themselves available that they would have a painless option to remove WhatsApp, but IMO, that's OK. It is a success, but playing the long game.