After a rocky start as NDP leader, Jagmeet Singh’s byelection win should quiet internal concerns about his future and bring at least a period of stability for the party as it seeks to “change the channel” and capitalize on an opening for the leader to prove himself on the national stage, say political pundits. But after months of focusing on Mr. Singh’s campaign, the party still has a long way to go to catch up to other parties in nominations and fundraising strength to ready itself for October’s general election.