It is only a guess what extremophile might be found next. There are several advantages, and notable disadvantages in terms of the extreme habitats in which these organisms reside. First, and foremost, there is no competition. There are virtually no threats from predators, which is the most common problem for life on earth. Much research has suggested that the existence of extremophiles may have allowed for the beginnings of life on earth to start. According to research, "Their study not only shows us how life functions at what we consider environmental extremes, but also teaches us much about the nature of life itself and about the possible properties of the first organisms that colonized planet Earth at a time when conditions were far more extreme," (Rainey 2006:2). However, there are disadvantages. The extreme conditions do limit the...

Based on the demanding needs of the environment, the organisms will always stay simple ones without being able to evolve much more within the boundaries of their individual habitats.
The existence of extremophiles shows that life can exist practically anywhere, even in the most extreme conditions. These tough organisms fought to claim their space in the most hospitable environments. With this in mind, it leads to the real possibility of the existence of life in the most extreme parts of our solar system.

References

Rainey, Fred a. (2006). Extremophiles, Vol. 35. Extrempohiles. Academic Press.

Wassenaar, T.M. (2009). Extremphiles. The Virtual Museum of Bacteria. Retrieved February 17, 2010 from http://www.bacteriamuseum.org/cms/Evolution/extremophiles.html