We're talking about mega sales, highly acclaimed and super iconic character IPs. Not Halo level, Mario level.

So I was wondering what others thought of this question. In future generations to come, will a Mario like IP ever be created? Or will there never be another Mario like IP?

I assume you'll be considering revenue, too, so something like Angry Birds doesn't qualify.
As far as video gaming goes, I'm quite sure that the answer is no. Mario became so iconic because he's often connected to what people consider the proper start of modern gaming. No matter what any future IP does, that cannot be matched.

It's rather unlikely really. Just take this generation as example. There have so far been sold 180 million Mario games in the 7th gen. If you look at publishers, how many have even sold 180 million copies in total this generation? (Since 2006)

Nintendo, obviously, with 607 million copies sold. Other than them, here's some of the biggest.

Electronic Arts: 330 million
Activision: 248 million
Ubisoft: 174 million
Sony: 142 million
Take-Two: 123 million
Microsoft: 90 million

If you take every single franchise these companies sell, and add them together, only two companies beat the sales of Mario. I honestly don't see anyone - except for possibly Electronic Arts - coming anywhere near selling the amount of software Nintendo does now. And Electronic Arts is a company with tons of small franchises, not few large ones like Nintendo.

The only company that can make an IP that will topple current-Mario in the forseeable future is Nintendo. It's possible that they will, but I doubt it, as they don't really have much of an insentive to.

There is already one that sits in the same level, Pokemon. This franchise is newer and sold near Mario, and remember all the licensed products, that Nintendo even created a separated enterprise only for Pokemon in Japan.

I also think about Tetris, its pretty huge game.

salewise and acclaim wise,yes

iconic - no,as when anything starts the first building block of that thing always looked back the prime ones

if you look at the fist few gaming generations too

games as unique as the following will be very very hard to emulate

Mario

Zelda

Metal Gear

Final Fantasy

No, gaming audience has grown, with gamers aged in there 30s and 40s now downwards, there isn't just a sole demand for games for children then in the past. So Iconic Characters associated with games isn't needed but also gaming has evolved from the play as a character defined by the developer to more of a character that you put your face onto and become. Basically Developers are aiming for a character that is a blank slate for you be be like in RPG's, tho you still get your characters in game.

Tho you never know, while gamers are getting older, doesn't mean that kids aren't playing games. A Developer might make the new iconic character to go with a console. But since its the working class older gamers with the largest of disposable income, publishers and developers want to make games for the bigger richer market.

So more than likely we will see a decline like what we have now in kids games as Gaming becomes more adult entertainment, which will in turn be bad for the kiddies, but good for the older games as more sensitive/adult themes will be explored more, creating more meaningful rich experiences. Tho as long as Nintendo is around there will be kiddy games, tho Nintendo have no intentions creating new characters or ips and rather bleed the ones they already have some more.

No

New Super Mario Bros (DS)  25.81 million
New Super Mario Bros Wii   21.98 million


Pokemon Diamond/Pearl  17.81 million
Pokemon Black/White       11.84 million

And yes I do see one in the future. It has to eventually happen

It will eventually happen, just like mickey.

Ever? I think that's a pretty big yes. Population growth over the course of humanities existance will pretty much ensure that there eventually is a franchise that sells much better than Mario on a launches aligned basis.

I think it's highly unlikely, as MArio will cotinue to sell, and thus expand his fanbase even more.

But I'd never say never.