Just for shiggles I tried to put together a list of primary, secondary, and third colors for each MLS team;
ATL- Red / Black / Gold
CHI- Red / Navy / White?
COL- Maroon / Lt. Blue / Yellow*
CLB- Yellow / Black / White
DCU- Red / Black / White
DAL- Red / Blue / White?
HOU- Orange / Gray / White?
LAG- Navy / Yellow / White
MIN- Gray? / Lt. Blue? / White?
MON- Blue / Black / White
NER- Navy / Red / White
NYC- Lt. Blue / Navy / Orange
NYR- Red / White / Navy
ORL- Purple / White / Gold?
PHI- Navy / White / Gold
POR- Green / Yellow / Red*
RSL- Red / Navy / Gold
SAN- Blue / Black / White
SEA- Nuclear Green / Blue / Navy
SKC- Lt. Blue / Navy / White
TOR- Red / White / Black?
VAN- White / Navy / Lt. Blue
Take a look at the premier league, where there are multiple teams with Red/White kits (Sunderland, Middlesbrough, Southampton, Stoke, Manchester United, Arsenal, Liverpool). Even Maroon and Lt. Blue is a popular combo (West Ham, Burnley, Aston Villa).
Due to a limited color spectrum with which to differentiate teams, and having a large company that isn't trying to go out of its way to impress anyone, we will continue to see similar kits thrown at us.
Of interest though, is seeing what the Rapids and Timbers have done with their secondary kits in regards to their locations. Colorado's yellow secondary was based on the state flag, and the Timber's red kit was based off of Portland's nickname of the "Rose City." Unfortunately for us, we already have the City's flag colors, so we probably won't have a crazy location based kit.