How come they never moved Power Rangers to Canada?
 

Another major issue that PR has had is that the show in shot in new Zealand. Don't get me wrong I love the country and the people but the place is way too far from the US. Canada is closer and cheaper than filming the show in the US. I think some of the major problems that the show has had since 2003 could've been fixed if they had moved to Canada.

I know! What's wrong with Canada? I'm from Canada!

Not only Canada needs love for PR, but also KR as well!

Maybe because location costs in Canada exceeded their budget and New Zealand was just right? At least that's how I saw it.

It's because NZ wasn't just cheap, it was the cheapest.
Production had to prove to Disney that continuing the franchise was worth it, and part of that was agreeing to move production to a place that was significantly cheaper than filming stateside. I'm sure while Canada was an option, NZ was noticeably more cost efficient.

That low cost is why, even after being sold back to Saban, they continued to film there.

Like Matrixbeast said, NZ was cheaper. Cheaper than Canada. When trying to reduce costs of a show by the utmost, you don't choose the relatively cheaper location, you go for the cheapest (whilst still allowing to film what's necessary) full stop.

What major problems specifically would have been solved by filming in Canada?

When I think of the main faults of the Disney era, the location is not one that springs to mind.

For me it comes to crossovers. And like I said in a previous post. Being cheap has hurt the franchise so much It's not gonna grow with that type of mindset.

While I do agree that being cheap hasn't been the best of choices for the franchise, it's also the only reason the franchise even survived post Wild Force.
As for why Saban and Hasbro didn't make use of the momentum Samurai had, beefing up the budget (Beyond just for the Legend War), I don't know.

Concerning the crossovers, while they weren't as consistent with them, Disney did still do them often.

I can see where you're coming from but you never know!

If the show wasn't as cheap to produce, it would need to make a ton more money to justify the increased costs. Hollywood isn't a good place for risk-taking - any movie or film investment is already a risk, so they have to be very strict and justify that the cost will be worth it. So my guess is that they're not willing to put extra money into it because they think it might help - the money has to come first. They know how it generally performs and set the budget based on that.

It's strange how the money plays such a large factor. It was a juggernaut during it's heyday, being the best selling boys toy brand for a bit in the 90's. Even when sales declined, it still maintained a steady level to justify it's continued production.

But the only time they tried to pump more money back into the franchise, it was through the films, rather than bolstering the TV series...