Well, I wouldn't necessarily say that modding will become more rare...
There will however, be a great schism between development mindsets, along the lines of "open-community" and "anti-community", and both will have their support and benefits and detractors.
There are many many "open-community" developers right at this very moment that wholeheartedly support modding and their communities, because they genuinely enjoy the creative process, and once the game goes out the door and is installed on your computer, they know it's no longer theirs to completely control how you choose to play with it.
As such I coin the term "open community", referring to their process of opening some aspect of content development to anyone who wants to take a crack at it, beyond what the developer themselves had put in as the base-game.
I liken it to LEGO's, if the LEGO company makes a set that builds a house, they know most people will take it home and build that house with that set, but in most lego manuals they acknowledge that many people don't always color within the lines, and so they commonly suggest alternative things you can build with the blocks provided.
And as anyone knows, any kind that's ever had more than one lego set in their lives has nearly universally used parts from countless sets to make something entirely new and different from either of the original sets.
So the "lego" developers are out there and they aren't opposed to their communities, and in many cases even endorse their creativity. Bethesda is an excellent example, but there are even lesser known examples, even developers like Rockstar, while profoundly infuriating for their needless interfaces and bloatware, they don't mind the community fiddling around with the textures, models, and pretty much everything else under the hood.
Then there is the "closed-community" developer... And please don't think of that as a derogatory term, it really isn't, it's really more of a description of their preference to keep development of their intellectual property contained within their house, or even semi-closed community that filters or controls what content can be added by the community.
For instance, Nintendo, a developer that on the whole I really really like, and while I haven't followed them too closely with the WiiU, I know they can deliver simply fantastic games. However in that same breath, they aren't overly eager about third-parties fiddling with their games. Heck they even sued Galoob (unsuccessfully) in the 80's for making the GameGenie...
Arguably the great great great grandfather of much of what our beloved cheats and trainers here do. Had Nintendo not lost that battle, it is VERY arguable that this site couldn't exist... But I digress...
A developer being "closed" to allowing external content development is within their rights, and I don't begrudge them not making public tools (software development kit or "SDK" ) that the community can use to fiddle with their games. What I do however take exception to is a developer reaching out, from their headquarters, across the internet, and intentionally changing (via updates) a game to expressly diminish or cripple the ability of a player to play their game the way they want to play it.
There is no fear whatsoever of online manipulation, because any incorrect (i.e. modified) files would not match up and thus not be allowed on public servers. So the only alternative is onerous control over every end-user and how they are going to be allowed to play the game they paid for.
I don't mind so much if a game is pretty much marketed as a "pre-set experience", I know going into a Zelda game that there isn't likely going to be any sort of SDK to make my own levels with, and I don't expect it. I play it for what it is.
However on the flip-side of the coin, in games like COH and Total War, even if the developer won't release any SDK, the community is still capable of many things, especially so on PC platforms. As such, I feel very strongly that while the developers need not support the community directly, they shouldn't actively seek to set them back and impede their progress either.
[Edited by knightpress, 6/30/2013 8:37:33 PM]