The Abbott FreeStyle Libre is very real competition.
Certainly Dexcom would be seriously negligent if they were to ignore Abbott.
I think there is no doubt that Dexcom CURRENTLY has the lead in terms of the technical aspects but to discount the product from Abbott especially when taking into consideration the muscle that such a large company as Abbott can bring to the table would be a serious error in business judgement on the part of Dexcom.
The cgm market is vast and growing. There certainly is room for multiple companies. Ideally, I would like to see Dexcom, Abbott, Medtronic and Senseonics all competing and striving to be the best. The products have significant differences such that instead of one product simply being “the best” there can be enough differences that people can choose what will meet their needs best.