Yes it is possible, even likely, that anxiety medication is being over-prescribed.
However is is also possible that there has been an explosion of anxiety in the population over the last few decades, so the prescribing is warranted.
Of course we all know the reasons for this avalanche of mental illness, not just anxiety but also depression and many other symptoms, in adults and children: fears about climate change and future energy supplies, 24 hour bad news on dedicated channels foregrounding wars and terrorism etc., fears about the economy, debt and student debt, the price of housing and downward expectations of social mobility, a cess-pit of websites and social media that promote porn to screw-up the boys and air-brushed models to screw-up the girls, online bullying which is more insidious that the old-fashioned school playground bullying, increasing obesity and negative body-image, and on and on and on.
Please god there is a big big increase in CAMHS funding.