Advanced telecommunication, easier and quicker transportation and global media made the access to different cultures and their languages more intense. Even if one is not intending to learn a new language, one is exposed constantly to many spoken tongues.
You will find more and more words from one language used in the conversations of people from various countries,which happened in the past as well, but not as intensive as nowadays due to the profound effect of globalization on such a phenomena.
However that doesn't mean there would be any tangible improvement in any language one is learning without a pursuit of advancement associated with the required efforts.