Being left out of the S&P's most recent group of additions is being overblown in my opinion.
Interesting note from the WSJ on the subject:
"The recent announcement doesn’t mean Tesla won’t join the S&P 500 in the near term. A spokesman for S&P Dow Jones Indices previously told The Wall Street Journal that the eight-person committee can opt to include a new company at any time—even outside the quarterly rebalancing."