Overall, there are three ways I see this being work.
First the micropayment with non-gameplay elements like skins, maybe avatars and similar stuff.
Second would be ad-based version. That would make the game entirely free.
Third would be to buy access. Having a basic version entirely free, where you can play only with people having the basic free version, but you can buy access to the stand-alone-addon and its units and play with people having those.
It would, in the end, create three to four groups:
1 - Free to Play Only
2 - Original Starcraft 2
3 - HotS Starcraft 2
4 - LotV Starcraft 2
1 and 2 might be the same list, even.
Of course, that would require the game to become compatible with the other versions, which might not be easy to do, maybe even downright impossible.
Also, the question is what about people, who bought the retails? Well, that they gain access to their own, respective list is obvious, maybe even too all lists.
And if they combine this with the first "selling skins", then maybe a retailer gets also 1/3 of all skins (owning all three would give you all skins avaible, obviously. Maybe depending on the game, you get skins for a specific faction.)
Well, I didn't think that through entirely, but the idea itself sounds great regardless.
First the micropayment with non-gameplay elements like skins, maybe avatars and similar stuff.
Second would be ad-based version. That would make the game entirely free.
Third would be to buy access. Having a basic version entirely free, where you can play only with people having the basic free version, but you can buy access to the stand-alone-addon and its units and play with people having those.
It would, in the end, create three to four groups:
1 - Free to Play Only
2 - Original Starcraft 2
3 - HotS Starcraft 2
4 - LotV Starcraft 2
1 and 2 might be the same list, even.
Of course, that would require the game to become compatible with the other versions, which might not be easy to do, maybe even downright impossible.
Also, the question is what about people, who bought the retails? Well, that they gain access to their own, respective list is obvious, maybe even too all lists.
And if they combine this with the first "selling skins", then maybe a retailer gets also 1/3 of all skins (owning all three would give you all skins avaible, obviously. Maybe depending on the game, you get skins for a specific faction.)
Well, I didn't think that through entirely, but the idea itself sounds great regardless.