My take on this is that there is nothing wrong with the adventure game dev being what it is. Let the small time people do it; they have love for it and will do a much better job than some big company trying to make a cash in. All the big companies offer anyway is better graphics, cut scenes, etc., and most adventure games don't really need these as long as they have good stories and puzzles. Sure, you could have Day of the Tentacle with Crysis-level graphics, but who cares?

The only major downside to the foreign companies doing these games is that the translations tend to suck REALLY badly. Stuff that might be really funny in Italy just doesn't work in the US.