Apart from a few full *** performances from the Dawg, the benefits of being a super climber has reduced dramatically because of new unipurito routes and teams being much more stronger than they used to be. So, teams and riders do not risk anything to gain 10 seconds to lose more time in the TT in most cases. Also, looks like the value of finishing 6th in GC become much more higher than it used to be, maybe that's how you get paid by the teams.
If you go through the GT's that had action from far out in last 10 years, you will see a few recurring factors.
Best climber/ best placed GC rider does not have/rely on the best team: 2006 Tour, 2007 Tour, 2007 Vuelta, 2011 Tour, 2015 Giro
The "underdog" in the GC is willing to attack at all costs: 2006 Vuelta, 2007 Tour, 2011 Tour, 2007 Vuelta, 2012 Vuelta, 2016 Vuelta, 2009 Giro, 2010 Giro (Basso and others were underdogs in the GC)
Best TT'er having a crappy team and not being the best climber: 2007 Tour, 2007 Vuelta, 2008 Tour, 2011 Tour, 2015 Vuelta
Crap weather/crash derailing the GC leader: 2013 Giro, 2016 Giro
So, unless I am missing something (feel free to correct me), it is becoming increasingly rare to see action from far out in GT's. I think the reason is we don't get enough "underdogs" because of the crappy route design and best riders usually have a very strong team, which kills the incentive to move from far out. So, we can expect to see less action with this type of design, or we have to hope for a Aquila stage to see action from far out, which becomes less and less likely with the lack of long hilly stages and stronger teams.
If you go through the GT's that had action from far out in last 10 years, you will see a few recurring factors.
Best climber/ best placed GC rider does not have/rely on the best team: 2006 Tour, 2007 Tour, 2007 Vuelta, 2011 Tour, 2015 Giro
The "underdog" in the GC is willing to attack at all costs: 2006 Vuelta, 2007 Tour, 2011 Tour, 2007 Vuelta, 2012 Vuelta, 2016 Vuelta, 2009 Giro, 2010 Giro (Basso and others were underdogs in the GC)
Best TT'er having a crappy team and not being the best climber: 2007 Tour, 2007 Vuelta, 2008 Tour, 2011 Tour, 2015 Vuelta
Crap weather/crash derailing the GC leader: 2013 Giro, 2016 Giro
So, unless I am missing something (feel free to correct me), it is becoming increasingly rare to see action from far out in GT's. I think the reason is we don't get enough "underdogs" because of the crappy route design and best riders usually have a very strong team, which kills the incentive to move from far out. So, we can expect to see less action with this type of design, or we have to hope for a Aquila stage to see action from far out, which becomes less and less likely with the lack of long hilly stages and stronger teams.