40 million

Lol, no, my argument is that game with online is more appealing than game without online in any case.

Around 5-6 hours is not very short single player campaign for online focused game,it would be for single player focused game. Going buy your point, whats exatly point of another single player campaign in Splatoon 2!? Hours length tutorial for Octolings!? :D   Answer is easy, making Splatoon 2 more appealing for single player players also despite game is online multiplayer focused.

No, fact is that games with more options, mods, content, online...are more appealing like package than same game that wouldn't had all that or someo of those things. MP4 can easily have sold online multiplayer mod and keep focused on singleplayer, similar like Splatoon is online multiplayer focused game but also has single player content. You didnt provide me any example what I talk about, while I gave you clear example of Nintendo game (Splatoon) but you still dont want to accept that.

Also, if you want make just simple thread with simple OP question, "if it would be better that MP4 also has online multiplayer mode !?". :)

5 hours is a short campaign even for shooters that is short it serves nothing more than to school the player, whats the point of another campaign? To sell the appeal of adding Octolings to the game not to mention the announcement they have planned in June.

No games having more modes doesn't make them more appealing by default in many cases it makes things more convoluted an appealing package is something that works overall as a product not a mish mash of modes that's flawed thinking you're using there more modes is not what appeals to consumers do you see Elder Scrolls or Fallout adding multiplayer modes and such? No you know why these games are not geared towards it, has their appeal grown as time goes on? Yes because they built on what they focused on which was open world single player rather than chasing after other parts of the market another series has on lock down. 

Nintendo already distinguished itself from the competition heavily with its brands and the Switch platform. An online FPS would actually be the least distinguishing thing they can do. The FPS genre is one of the most heavily saturated genres out there, and Metroid is somewhat of a medium tier franchise, it has less appeal than like Splatoon (which took the less contested third person route, certainly a more distinct approach than Metroid) and certainly less appeal than CoD and other major FPS franchises.

Again, around 5-6 hours is not very short single player campaign for online focused game, it would be for single player focused game. You can scholl player in 10-15 min tutorial, you don't need 5-6 hours full singleplayer campaign for that. They can sell Octolings without another single player campaign. Reality is that they just want to make Splatoon 2 more appealing for single player players also despite game is online multiplayer focused.

MP4 can easily have solid online multiplayer mod and keep focused on singleplayer, similar like Splatoon is online multiplayer focused game but also has single player content. Also, becuase paid online Nintendo could force online multiplayer for MP4.

When the likes of COD hav 7-8 hours and its considered short then 5 hours falls into the same boat no two ways about, you can school players in many ways it still doesn't debunk that the single player is mainly for players to get acquainted with the unique mechanics.

Splatoon's single player is nothing to write home about so it having a single player doesn't really help your point especially as the vast majority of player don't bother with it right now your argument hinges on a what if scenario that Prime 4 can have both on equal level historically games in recent times have not managed that with the higher demands of development it's not as easily achieved as you say for a start Prime's design doesn't translate to MP well.

What exalty unique mechanics CoD has that needs singleplayer campaign of 7-8 hours!? :)

Players who care about singleplayer care about Splatoon campaign, and that doesnt relly matter, fact is that Splatoon with single player campaign is more appealing game in any case that it would whitout it. With MP4 online multiplayer would be same, probably majority of players wouldnt care about online multiplayer, but there would players that would care and game would be more appealing in any case.

You didn't read things properly that's in regards to Splatoon.

Players who care mainly about single player would hardly have Splatoon on their radar its single player campaign is 5 hours of walking the player through levels design to teach them to get used to the gameplay the vast majority of people do not buy it for single player, players who are into single player will be picking up games like BOTW, SMO, XBC2 etc... This is why your whole outlook is flawed, Metroid are a franchise is barely mid tier when it comes to commercial pull if you think that tacking on multiplayer will magically do wonders you're in for a massive shock and don't truly realised how the mainstream consumers think. 

They wouldn't care that Metroid adds MP as they'll continue to get their fill from COD and BG as well other established franchises the first person genre as a whole is the most actively crowded right now it's like JRPGs in the late 90s and early 00s, the series doesn't even stand out in the genre to attract new players let alone have a tacked on mode attract people.

Of course it's not always about the budget, but rather how you use it. They could take 100 million and do Other M part two or they could take 10 million and create a game with gameplay comparable to Metroid Prime 1.

One thing I've also noticed is that over the years bigger budgets have come to mean bigger teams and studios. But larger studios actually don't always produce better games - in fact I believe smaller studios are better as they allow for more collaboration and involvement between the team members. With a large studio, there might be a programmer responsible for a few class definitions and methods, who (consequently) only interacts with who he/she needs to. In a smaller team, that same programmer could be responsible for vast swathes of the game, perhaps heading a certain area like UI or something.

There's much more involvement in that.