Reason for optimism: If as a fan you value stability, and like to purchase player jerseys that remain current for an extended period of time, the low-turnover Angels are you're kind of team.
Reason for pessimism: Stability, as a trait, has a lot more value if the players you retain are actually valuable.
In the Oakland A's preview it's asserted that, despite having the worst record in the American League in 2015, the A's actually played better than half of the league. Although the discussion turned its focus on one of the teams that benefited from Oakland's poor luck (the division-winning Texas Rangers), the Los Angeles Angels fit that bill as well.
Despite being outscored by their opponents in 2015, the Angels managed to win 85 games and sat just two games out of first place with six games left in the season, on the strength of an extraordinary record in one-run games. Los Angeles went 35-17 in one-run games, the seventh-best winning percentage in that category over the past 25 years and the most in one-run games since 1993.