if the better riders attack on Iseran, differences will be big at the finish. I think the stage has everything to make big attacks possible. Early hard climbs to send up team mates up the rode. First part of the Iseran for reduzing the peloton. Second part for big attacks. Of course if you have a 2012-2017 situation, no stage will be watchable, whatever how great a design can be.
No it's not a Mortirolo - Aprica combi from which you know it will 100% deliver. But a Mortirolo - Aprica combo is quite predictable as well. If this stage deliver is more interesting to watch.
I would like to see a (full) Iseran, Mont Cenis, Finestre, Sestriere and Montgenevre and Briancon finish with the steep ramps in the old town. Only second half of the Iseran would be ok as well.