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You can bet your sweet ass (as sure as I'm fat) that Curse will figure a way for mods to reside behind it's premium service. This is worse than WoW because no one uses 10 or 20 mods with Wow but we routinely use 40+ mods with Mc. Can you imagine how long it would take, using the current curse client. There goes the speedy updates we currently all enjoy. Hello premium launcher!!
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I currently have well over 100 mods installed to WoW (Assuming you count like FML in other words: how many modules are loaded). The drops to 73 if you go for individual projects (Like Auctioneer/TradeSkillMaster/MogIt/Titan).
EVEN WITH the curse client parallel download limit (Two addons updating at the same time, no more. You can easily queue up 50 at once for a first install of a mod; I know I did when I re-installed WoW recently). This is still 100 times faster to update than even manually FINDING the updates, let alone navigating the download pages, waiting for the ad showing & bot/spam preventing timers, or unzipping them into my addon directory.
Note that the ATLauncher already does a similar serial download process. Automated, yes, but honestly that's how it's going to get done. One mod at a time, maybe you get the convenience feature of being able to click one button, maybe not. But complaining about having to click your mouse 100 times each time waiting for the previous download to finish seems a bit... whiny... to me.
I have 100+ mods (FML count) installed in my private self-assembled pack for my personal LAN server. I USED to have to load up all 70-odd pages (yay for multiple mods from the same author in the same location!) in my browser, either one by one or in a tab folder (both took similar amounts of time thanks to the MASSIVE lag when opening 70 tabs at once).
Then I get to check each of those pages to see if the version numbers changed on any of my mods (thank god I've got that in a list because nobody could be bothered to standardize the versioning outside of the FML screen. Nearly all my mods do this now, but I remember when 3/4 of them were just IronChests.zip and Thaumcraft.jar instead of ironchest-universal-1.6.4-5.4.1.641.zip which I can at least use!)
Then I get to sit through 1-30 adf.ly screens, at 5-8 seconds a pop. Finally I move them to my mods folder and see what breaks (if anything, usually nothing)
Now I'm using NotEnoughMods, but I still have to waste an eternity sitting through adf.ly links.
So the download throttling? Yeah that's not a concern to me. ANYTHING from a central repository will be faster than what we currently have in place other than a pre-assembled and authorized pack like the ones from FTB... and updating even the MegaSuperUltimateAllTheMods pack for 1.7 or whatever? One mod at a time, if the ENTIRE pack needed an update for EVERY SINGLE MOD. It will take something really close to your maximum download rate, you just have to click some.
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My only real concern which isn't simply Moderators from other parts of the curse network being power-abusive and wrecking my Minecraft experience. That's not something Slow can really fix, and Curse likely won't block the ability to Globally Ban. That concern is central-location for mods that doesn't have all the mods. I'm hoping that Lex and Slow can manage to make curseforge appeal to the modders at large. If not this venture is pretty doomed. Because while I don't mind adding a mod or two manually... for packs? That will KILL them for the end user.