I find it hard to see any of the teams with a 3-1 lead blowing it, but I'll run through the list.
-Winnipeg may have the best chance of the three. Colorado's really scary when they can control the play and rather dominated the Jets in game 4. However, Hellebuyck, despite his performance so far in the playoffs, is a good goalie and could very well steal a game or two. Georgiev, after getting lit up in game 1, has been pretty solid, but is still a bit of a question mark. It'll be interesting to see what happens.
-I'm just not seeing it with Toronto. Swayman has been great and Toronto is not doing well with their power play chances. It's gone really cold. However, just because the hockey gods are weird sometimes, I could see this getting to a game 7, with Toronto losing game 7.
-Nashville lost a heartbreaker in game 4, blowing a two-goal lead late and losing in overtime where they had a really good chance to even the series with a home win instead. Vancouver's goaltending carousel is their biggest weakness going forward in the rest of the series, but they've played quite admirably in front of DeSmith and Silovs. I'm not really seeing Nashville taking 3 in a row.
-Tampa Bay is thin on depth but still has a decent core and a decent goalie. Them being down 3-0 before avoiding the sweep aside, you never know. However, Bobrovsky is a really good goalie and has been playing well this series. I highly doubt he turns into a pumpkin to allow the reverse sweep, and could very well just "goalie" the Bolts into one more win to cap off the series.
-The New York Islanders have actually kept all four games reasonably close, including blowing their 3-0 lead in one game. Carolina has an edge over them, but it's not a huge edge due to their play style. Each game might as well be a coin flip, but you never know, they could get lucky. That said, I don't like their chances either.