Counterfeiters were already producing microchipped bags. All they have to do now is know what the microchip will do when scanned. If people can make scannable fake IDs, I'm pretty sure they will figure out a way to make scannable microchips. It most likely won't pass LV, but to a consumer who doesn't know what to look for, they might be more easily duped. Unless LV allows in-store authentication, I don't see microchipping helping the general public.
Microchipping could help track a bag, and it could potentially weed out pesky resellers, but if the majority of "it" bags don't need to be serviced, it would defeat any potential tracking. It might pose a big problem to people who buy and sell LV bags seasonally, not because they're resellers, but because they have the money to treat it as fast fashion. Lastly, if personal info is attached to a bag's microchip, that potentially puts our privacy at risk. There are brilliant hackers out there -and you just gave them a list of global customers. If they can see purchase history, they now know who might make very lucrative targets.
If you ask me, the best way to tell if something is real or fake is to "hide" something within the bag that cannot be scanned or seen. If Anish Kapoor has exclusive rights to use Vantablack (blackest black paint), then I'm pretty sure LV could employ a lab to create some kind of reagant that is exclusive to them. Maybe the datecode could be coated in compound A that when painted with compound B, it goes to lime green and then dries back to its clear and "normal" state. You could even stamp compound A onto the datecode with a design that changes globally on a quarterly or yearly basis. It's not foolproof, but it sure would throw counterfeiters off because you can't see what makes a bag authentic. As with all marks of authenticity, it doesn't really help the general public unless LV decides to offer aunthentication services.