Raiding has always been the preserve of elitists who had the time and, more importantly, connections to get into a raid guild. Lost your internet connection for a month? Tough luck you're too far behind and /gkicked. Only just started playing/hit top level? Too late you've missed the boat: we're all in BWL/SSC now, GL catching up solo. Rolled an oversubscribed class? Tough luck all the raid guilds don't need you. GL getting to see end game content now.
See how these obstacles have nothing to do with your skill?
With Gruul being the 25man step after kara no matter how good you and your 9 friends were you were barred from progressing. At least now not having organised a massive guild won't stop you from playing your role well, and you can make progess in 10 man when 25 man raiding isn't available to you and then switch to 25man, albeit at a slightly lower level than you were in 10 man, if the option becomes available.