"someone has to come last. "
I might be misinterpreting here But why? I have always believed that GW games would be more enjoyable and Hobbyist friendly if each race was pretty equally updated. If it was equal in book and models it would make each race a fun and viable choice. (note army's can still be fun and viable choices)
What I said was that, on a scale of power, someone has to come last. It's impossible for fifteen very different army books to all have the same level of power and effectiveness. Someone has to come last just as someone has to come first.
Actually, I don't think Brets are last, it's near the bottom though. Thing is, when I compare the Fantasy armies to 40k... Wow, they look nigh-perfectly balanced. The gulf between top and bottom tiers is actually pretty small.
Fantasy is far better balanced than 40k. Fantasy doesn't have Marines hogging the spotlight. We should be celebrating these things, not complaining about the small niggles.
Which brings me on to update schedules.
Here's an uncomfortable fact: Games Workshop isn't Father Christmas. They aren't actually there to bring toys to all the good boys and girls.
They have bills to pay, Shareholders to placate and accountants to make them do both.
Updating an army costs about the same, no matter which army. Some armies are guaranteed to sell well. Marines, WoC, High Elves. Some armies are slightly iffier. Brets, Dark Eldar, the poor, poor, sad-girls-crying-in-the-corner Sisters of Battle.
Since updating any army costs the same, but some armies will make far more money for that outlay, GW have to concentrate on them. Those armies subsidise the others. Daemons of Chaos got updated this year, but it's the High Elves, Dark Elves and Lizardmen still to come that will pay for that update.
Look for a pattern of about 2 or 2.5 popular armies for every niche one.