The return of the golden age of Rare games on Nintendo systems might not be as unfeasible as fans might think, as the creator of Conker's Bad Fur Day believes that the classic Rare franchises will return to Nintendo systems in the future.
Rare was once closely associated with Nintendo, as the company produced classic titles like the Donkey Kong Country series, Killer Instinct, Goldeneye 007, the Banjo-Kazooie series, and the Perfect Dark series for different Nintendo systems. The relationship between Nintendo and Rare seemingly ended in 2002 when Microsoft purchased the company and used it to produce games for Windows computers and Xbox systems.
There is at least one former prominent figure at Rare who believes that the Rare franchises will return to Nintendo systems at some point. Chris Seavor worked at Rare from 1994 to 2011, where he created Conker's Bad Fur Day and worked on many different games. Seavor recently spoke to Video Games Chronicle about the potential chances of the Rare franchises being revived on Nintendo systems.
“It is significant, very significant but it was also inevitable... You only have to look at the reaction to Banjo’s appearing in Smash to see that this was purely a fan driven thing, and fans are if nothing else a noisy and belligerent bunch. I mean, it’s an abbreviation of ‘Fanatic’ after all."
“Whether they’ll be as loud about the other IP’s including Conker is up for debate… I’d say not likely.”
It seems that Microsoft and Nintendo have had a closer relationship than anyone realized, as Cuphead was released for the Nintendo Switch and Banjo-Kazooie are coming to Super Smash Bros. Ultimate as DLC characters. It's possible that this relationship was born out of necessity, as Sony has been the market leader in terms of sales with the PlayStation 4, even considering the Switch's success. Microsoft has control over all of these Rare properties that its core audience doesn't care about, so it's possible that the decision could be made to try and market them to the Nintendo fanbase who adore them.
Microsoft has been buying up studios in preparation for the next console generation, so it's unlikely that the company would ever consider selling Rare and its assets to Nintendo, as another exclusive war is being planned for the PlayStation 5/Xbox Scarlett generation. It's more likely that the old Rare franchises would be revived with new iterations, but they would be multi-platform releases, as the majority of the people who want to see a new Banjo-Kazooie game belong to the Nintendo fanbase and who enjoyed the original games in the series.