I sincery hope larian will make D2 modder friendly.
Turning a game easy to mod is a gigantic boost in the value-for-money ratio of a game since we can expect to spend €50, but later on have free, easy to get new content that will extend the life of our purchage.
Just look for example on Oblivion. Its a game with a "couple years", but the modding community has kept it very much alive, and still selling copies. For example, i bought the game after seeing on youtube a video of the "qarl texture pack", and it looked awesome, or for example Deadly reflexes mod that change the combat system.
Another example is Gothic3. I would never touch it without the mods due to bugs and lousy reviews on the internet, but after reading comments that some unnoficial comunity patches changed all that, i spent my money on a copy of it also.
Agreed w/ all this.
Plus, games that were left broken -- like Arcanum and Vamp: Bloodlines -- got even more fixed-up, thanks to modders.

DragonAge will be a gigantic seller. They were smart enough to say this game is just the beggining and a lot of new content (oficial and comunity) will come up, virtualy turning your € 50,00 into much much more.
I'm hopping Torchlight will take-off b/c of its robust SDK that'll come w/ the game.
Divinity 2, with a good modding comunity, has GIGANTIC potential to be an terrific value for money and i hope they will embrace the modding comunity for i am sure to be alert on that!
I agree w/ you.
I know BethSoft likes to use the GameByro Engine b/c they find it quick and easy to make new content w/in the GB Engines -- so, I hope the Larian finds the same true, as well.
