The only way the cap rise will be that low is if magic wundervirus COVID 2.0 happens, 2.5 mill-ish raise per year is extremely low.
Inflation (I'm guessing many people actually don't properly understand this) is a thing for starters. Everything is more expensive at all these sports events, on what planet is anyone paying the same price for a ticket, jersey, beer, hot dog, parking, etc. etc. at any of these events? Even going to the movies is way higher than 5 years ago, that's not going to stop. Utah will earn more revenue than the peanuts Arizona was bringing in, there's a Five Nations Tournament too ... there's no way the cap rise will be 2 million next season after going up 4 this year.
The year after that the Canadian TV deal expires and likely the NHL is going to get the largest TV deal in their history. There's no way that's going to just be a ho-hum 2.5 million rise as well.
You're assigning magical value to the number 100 million thinking it's something special and thus requires some special effort to get to, it's not, it's just a number like 99 or 101 or 102 or 98.
I would say 3.5-4 million salary cap rise for next season, followed by probably a larger bump because of the TV deal the year after, maybe 5+ million, you're already very close to 100 million in just 2 years.