I have studied various arts for more than 19 of my 26 years. At no time did I or any of my instructors seek advancement in their respective arts simply so they could more efficiently pound someone into the dirt. While it can be stated that a practitioner of a strictly stand-up style is at a disadvantage when the fight goes to the ground, it can also be said that a grappler is at a disadvantage when the fight remains upright. The key is to never do what your opponent expects or wants you to do. What is important is the tenacity, conviction, and level of commitment of the individual.
Every style has the distinction of being more well suited to a given situation than another style.
Keep an open mind, that's what it is all about.