I think sooner or later the "corporations" will make their way into FFH2 via modmods (one of the bigger mods already has some but I'm sure more will appear and one day we will have quite a selection. If some concepts get huge approval one of the most popular gameplay-enhancement mod-mods like FF might incorporate them.)
In hindsight i have to say that the way Guilds where the decision to cut them sure doesn't hurt (the 2 most interesting ones really work even better as wonders and the others are likely just as possible via events. Still Gaelan should appear more often. He is far to rare by any measure. Cut of Aneron's bounty hurts my playstyle a bit, so i miss it a little. But the new chosen sure is interesting enough to be a suitable replacement in terms of gameplay / fun).
While i can understand why Kael / the team decided not to go for these features i sure would be quite interested to test them combined with FFH2 (BtS would likely just be way to boring for me to test those features there...). Better not exposing newer players with even more features though. Given the existing sometimes overwhelming density of FFH2.
Better keep it to players who already have explored most of the mod and are deliberately looking for more...
In terms of espionage i wasn't so sure that the loss was a big deal during mid-shadow (that's the feature i actually hoped most for when the jump to Bts was done. But forgot about afterwards thanks to the big steps the mod did during Shadow and Marnok's highly appreciated contribution
.).
But then the ideas for rumor & intrigue mod-mod came up and I'm very fond of the concept presented there because it seems to fit nicely with the flavor of FFH 2...
So I'm still hopeful and would suggest to not go all doom and gloom about the feature of guilds. You'll just need quite some patience though until someone goes for it in earnest, which might still be a few month off.
Once the mod has come so far that the updates will become less frequent I'm sure mod-modding will increase quite a bit.