FWIW, we've climbed to 4th or 5th in betting odds to win the MLS Cup, depending on the site. Strangely enough, oddsmakers still like the Red Bulls as high as 2nd on one site. Generally though, it goes Los Angeles, Dallas, Colorado, and then either NYCFC or Red Bulls.
I'm not sure if I'm allowed to link betting sites, but here's a copy and paste from one:
Los Angeles Galaxy+400(4)Compare odds
FC Dallas+737(4)Compare odds
Colorado Rapids+787(4)Compare odds
New York City+900(4)Compare odds
New York Red Bulls+975(4)Compare odds
Sporting Kansas City+1500(4)Compare odds
Portland Timbers+1625(4)Compare odds
Real Salt Lake+1625(4)Compare odds
Vancouver Whitecaps+1850(4)Compare odds
Philadelphia Union+1875(4)Compare odds
Montreal Impact+2000(4)Compare odds
Toronto FC+2125(4)Compare odds
New England Revolution+3400(4)Compare odds
San Jose Earthquakes+3475(4)Compare odds
DC United+3925(4)Compare odds
Seattle Sounders+4650(4)Compare odds
Orlando City+4875(4)Compare odds
Columbus Crew+6575(4)Compare odds
Houston Dynamo+9400(4)Compare odds
Chicago Fire+12500