The core vote for the Liberals isn't 30%, its alot lower then that.
Anyways looking at what's left in the NDP alot of the old guard had retired or just lost.
Peter Stouffer, Pat Martin, Megan Leslie, all lost. Yvonne Godin had retired. The Toronto caucus was wiped out. Some of the BC MPs had retired befire the election.
What is left of the old guard are Charlie Angus, David Christopherson, Peter Julian, and Nathan Cullen. Almost everyone else is realitively new, mid 2000's at the oldest, and most elected in 2011 or even 2015.
A good chunk of the BC caucus is new, all three of the NDP Sask MPs are new, 50% of the NDP Manitoba MPs are new (fine okay there are only 2 in the province period), 2 new NDP MPs in Ontario, 1 or 2 of the MPs in Quebec are new, the rest of the Quebec MPs are from 2011, except Tom of course.
They are in a good position to renew itself.
As bad as the NDP bombed, they're still better positioned then at any time before 2011.