I'm sorry to break up the dem lovefest, but while that map looks great for Clinton, it is also based on polls from her leading the race nationally by quite a bit. If Trump takes 4-5 points on Clinton nationally then I wouldn't count on Clinton having an electorate college firewall.
"That map" as a comfortable firewall, stands as of today, with trump already making some inroads against Hillary, and not by "her leading the race nationally by quite a bit."
Yes, the firewall begins to break-down if trump can bring the national numbers to exactly even or with a small +1 or +2 lead .... but in my opinion, that will be very difficult for him to do.