Can I lose my trademark monopoly ?

Yes, if your brand, product or service achieves term became a popular and generic term, the trademark can be deemed to be be publicly owned and thus the brand can be lost.

An example of this is when the term “Xerox” was lost by the owners, as the word became so popular to mean photocopies. However, the chances of this happening is very rare, and if it does happen the owner of the trademark monopoly will have even greater benefit from “losing” the monopoly.