I think the kids are OK.
Using as much data from the market disclosures as I could, along with a few guesses, I had a look at the ROE on broker sourced loans at NAB.
If the hurdle rate is around 6%, then broker sourced loans must have a discount that is on average more than 60bp worse than the rest of the book.
Maybe this is true. Though given most new lending will come on at a discount to existing loans (their own disclosures show this), then I suspect the spread between branch and broker loans is closer than 60bp.
Another swing factor is the average life of broker loans. But, given broker loans are just over 50% of the home loan book, the life of broker loans is probably not that different to the overall mean (of around 5 years).
This means while the ROE for NAB was 11.7% as of March 2024, home loans have an ROE of at least 14%, with brokers a little less and branch loans a little more.
The main difference will be broker commissions. But, branches come with a bigger fixed cost. And customers are going to brokers, so NAB (just like nearly everyone else) has to present where their customers are.
Yeah, brokers aren't going away.