It should be up to the ref to stop it. He's qualified to.
No, it's a perfectly sensible idea. Hand control back to the people who are responsible to judge. If it's a head injury / breathing issues then one of the four officials is perfectly qualified to call it. Same for a broken limb...
As a relatively new, soon to be qualified, under 9s coach I can tell you this isn't limited to the pros. A lot of kids have watched the pros do this and now they go down at the slightest touch if the other team is through, my own son included :rant:
In the pro and semi pro game it should be...