For us adventurers it seems so. But apparently, their later games were a big enough success for them to keep that concept.
I really liked their adventure games up to Back to the Future. They jumped the shark with Jurassic Park, imho, ie. the game which abandoned the classic adventure design.
Btw., most of their DVDs don’t have DRM. Some titles have DVD based copy protection, though, but not all of them.
And it’s a pity they don’t care for their early games anymore. Right in the first Sam & Max episode is an annoying bug (Sybil is invisible and has her hotspot misplaced), introduced with an engine update. This is known for years, but they don’t fix it.
In their early days, they promised to offer patches to remove DRM from their games when the company shuts down their activation servers. It’s not completely unlikely, but I wouldn’t bet on it. At least Adobe did such a thing in the past.