If Call of Duty were to come to subscription services such as Xbox Game Pass, it would hugely affect the business model.

That's according to Ampere Games' research director Piers Harding-Rolls (pictured), who told GamesIndustry.biz that the shooter's addition to subscription platforms could see the number of people paying for these services go through the roof.

"If Call of Duty is added day-and-date to Game Pass, it will have a notable impact on subscriber numbers," Harding-Rolls said.

"Additionally, the inclusion of Warzone with added Game Pass perks will help with engagement and retention. Call of Duty is regular and big enough to provide a meaningful bump to the subscription opportunity, which in turn may result in publishers reviewing their triple-A budgets, product, and monetisation strategies."

Whether it would change the perception of subscription services for those in the industry is unclear. Though it has seen growth in recent years, whether the business model actually works for developers and publishers is still up in the air.

"Activision Blizzard has been inactive in terms of bringing its games to content services so far, so the extent of positive impact is not really known," Harding-Rolls said.

"It is difficult to say whether this would amount to a tipping point in publisher attitudes towards subscription services. Commercially, there are still lots of question marks in terms of balancing the books for many publishers and the service catalogues are small compared to the broader platform game collections."

This comes after Xbox has reportedly told Sony that it can have Call of Duty for its PlayStation Plus subscription service. This is part of a wave of sweeteners that Microsoft is rolling out to show that there will be no impact on the industry were it to buy Activision Blizzard.