TMA's and pure stand up striking arts have been unfairly over criticised and belittled in the recent past (one particular BS website springs to mind!) Obviously this is complete nonsense as some one in this thread has correctly pointed out all fights start standing up! However, the danger with this situation is that in an effort to defend ones self and art one can end up polarising oneself and moving to the other end of the spectrum by over criticising ground fighting and grappling arts.
Just as many grapplers make assumptions that striking arts are some how unable to adapt to the street situation and assume that the striker will always be attempting high spinning head kicks rather than using powerful limb shattering strikes, knees and elbows, bites and gouges it is clear to me that some strikers seem to assume that the grapplers are unable to adapt to the street situation and will always be looking for a complicated leg lock or hold and, for some inexplicable reason, would not want to get up on their feet and run as soon as they can, rather than using powerful fast joint breaks, knees and elbows and bites and gouges!
I really don't think it matters if most fights go to the ground or not. What matters to me is that it is a possibility. I think most sensible people would agree it is not the place you want to be and no matter what your system is, striking or grappling, you need to adapt your training to this situation and use what ever means or techniques that enable you to get back on your feet and escape as quickly as possible.
Being a bit of a fan I always like to throw in a relevant article by my chief jujutsu instructor Kevin O'Hagan! Here are two on adapting grappling arts to the street situation....
http://www.kevinohagan.com/Webpages/Pages/Articles_Grappling_Realistic.htm
http://www.kevinohagan.com/Webpages/Pages/Articles_Grappling_Combat.htm