This is a tougher schedule than last year. Playoff team schedule is always tougher unless you're the Patriots.
10-6 is doable... 11-5 is also doable.
I like the Colts chances this coming year. HOWEVER... every team strives to be better.
With the scheduling changes from about a decade ago, this is really a misnomer now. Every team in a given division plays 14 identical games: 6 in-division, 4 against a common in-conference division, and 4 against a common cross-conference division. (And the intra- and inter-conference division matchups are determined according to a defined rotation.) At most, prior season results can impact 2 out of 16 games.