One rule of television is that everyone loves a successful show.
The channel loves it. The audience loves it. The people who get a pay cheque through appearing on it love it.
And, after they get over their anger at a rival beating them, the other networks come to love it too.
Because they can see a way to make their own successful show - by copying the first one.
A renovation show is a success? Well, just watch as the other networks create their own.
A cooking competition goes gangbusters? Look to the other networks putting their own spin on the concept.
People love that singing contest on one network? At least one similar version will pop up in the next 12 months
Which means it's a virtual certainty that in the next year or two we'll see shows in the "adults play with kids' toys" genre.
They'll be looking to copy the surprise success of Lego Masters, which has been absolutely killing it in the ratings.
The success surprised me a bit; I had no interest in watching people make stuff out of Lego.
Yet, I found the show quite enjoyable. That's no doubt in large part to host Hamish Blake, who injects genuine humour into the show, which includes a bit of piss-taking at the reality TV genre (eg, when a contestant's construction falls down, Blake lent into shot and said "looks like it's time for a commercial break").
He's really the X-factor in the show. Without Blake in charge, the show would be quite flat. Lego fans would still watch, but it wouldn't draw in the viewers who just want to be entertained.
The contestants, while skilled with Lego, aren't by and large the sort of characters that would keep you tuning in (except for Kale, who is amusing because of his deluded sense that his ideas are always brilliant).
It certainly wouldn't work with judge "Brickman" (his grown-up name is Ryan McNaught) as the focal point; much of his work on the show seems to be repeating what Blake has just said but in an unconvincing "excited" tone.
Other networks could try and replicate Lego Masters - and some of them certainly will - but they'll probably fail.