Are you looking forward to all the "Is Jeanne Shaheen the Dean Heller of 2020?" posts in 2019-2020? lol
It's going to be terrible, honestly. Think of all the millions the GOP will waste there when they could spend their money wisely in NC, MT, GA, AK, etc. to defend all the vulnerable seats. Maybe 2018 and 2020 will teach them a lesson, but I doubt it. Even if the GOP loses everything in NH, I'm sure the usual "experts" will consider Hassan vulnerable in 2022, lol.
you said landslide though
These says, a Republican "landslide" would mean that they're winning 323-337 EV and the PV by 1-2 points. And even that is a stretch.
No prominent political analyst would consider a 1% PV win a landslide.