5-6 years is a long time...
You can basically take all of the top contenders right now, and I'd bet every one of them is mediocre or worse in 5 years time.
Just look at the ages of all the core guys on the best teams around in 5 years:
McDavid: 27-->32
Draisaitl: 28-->33(34 in October)
RNH: 31-->36
Hyman: 32-->37
Bouchard: 24-->29(30 In October)
Barkov: 28-->33(34 In September)
Tkachuk: 26-->31(32 In December)
Reinhart: 28-->33(34 in November)
Forsling: 28-->33
Verhaeghe: 28-->33(34 in August)
Mackinnon: 28-->33(34 in September)
Rantanen: 27-->32(33 in October)
Makar: 25-->30(31 in October)
Toews: 30-->35
Landeskog: 31-->36(37 in November)
Panarin: 32-->37(38 in October)
Kreider: 33--38
Trocheck: 31-->36
Fox: 26-->31
Zibanejad: 31-->36
Eichel: 27-->32(33 in October)
Stone: 32-->37
Hertl: 30-->35(36 in Novemer)
Hanifin: 27-->32
Theodore: 28-->33(34 in Novemer)
Basically all of the contenders right now will be very old. They'll all have regressed to varying degrees and will very likely be holding onto the hope of playoff hockey with very little expectation for success beyond a first round appearance. Just look at the Caps, Penguins, hell even Tampa Bay at this point.
5-6 years is a very long time and it's pretty unlikely any of the current best teams are still anywhere near the top of the league and most will be in the mediocrity stage until the next full rebuild begins.
No chance. They're already on the low end of mediocrity right now. They're heading downward over the next 5 years, not treading water.
They're a team that will enter a full tear down and rebuild in the next 5 years.
