This is just the start
It's clearly going to continue until international co-operation between governments and police forces is greater than international co-operation between criminal gang members. They'll continue to kidnap people while it makes economic sense to do so. So basically until AI gets effective enough to scam people. All you need is an AI voice to simulate a bad phone line and a poor English (or whatever) accent.
On the other hand, if it became harder to scam people, things would change. This is the nub of the matter: the effort is minimal and the potential rewards are huge.