s/click/viewers and the basic business model has been going strong for half a century.

s/clicks/listeners and the basic business model has been going strong for just a little over a century.

s/clicks/circulation and the basic business model has been going strong for at least a few centuries now.

So, never. Or, more accurately, in about 20 years when "clicking" becomes an anachronism and someone will make this comment except it'll be: "s/taps/clicks and this has been going on for half a century"