There is a valid argument for looking for alternatives to routine worming of non infected dogs and I say that as a vet (who obviously gets all my income from selling chemical wormers!)
Resistance to wormers is widespread in farm animals and there is no reason why this will not happen in dogs. Also there is the environmental impact to be considered.
We already see the need for stronger flea and tick treatment than in the last few year. Frontline used to do the job and no longer works, Advantix is no longer working on ticks and some vets are also seeing failures in the Seresto collars.
Wormers are pretty sophisticated little organisms and are able to survive against all odds including wormers. We must also be aware of the spread to humans so all worming plans need to be 100% effective for everyones safety.
What is the way forward? For me herbal, alternatives are not tested and have no evidence of working.
Chemical wormers at the moment are working for some dogs, if they are used correctly but resistance is something we need to be aware of and act accordingly to prevent this.
It does need to be made clear that wormers will do nothing if the dog is not infected. he wormers act on the larvae of the worms once the dog is infected. I spend a lot of time explaining this to my clients who seem to believe that wormers will stop the dog picking up the worms.
Worm counting has been used for years and is now able to test for larvae but again does need owner compliance - many owners would not want to send off 3 days of poo samples.
Re comments by the swimmingthebluelagoon worm count testing is not left for months so there would be no damage, same really as monthly worm treatment the wormer will not be working all month on the dog just when taken.
I think there also may be a bit of confusion re tape worms.