The system is the only reason that she is the queen, primogeniture.
If you go back to how her grandfather inherited the Bowes-Lyon, you'll find it's only the money side of it, the Bowes money, from the coalfields of Durham, that made her as important as she was.
In fact, when the queen mother was married, the Bowes-Lyons had to sell a castle to pay for the wedding.
The latest Earl of Strathmore died in February.
He had been a government whip in the House of Lords, and helped John Major get the Maastricht Bill on the Statute book. He has four sons, so that should keep the line going, but if they die without sons, the title will pass onto his brother.
That's how the queen mother ended up being important, because her father inherited from a brother.