It's not a sign of disinterest in games. It's a sign of disinterest in traditional home consoles. Mobile and PC is where a significant amount of people are now and it doesn't look like they're coming back anytime soon.
the industry-wide misconception is that these people were ever here to stay in the first place and not just a bubble. It's like lamenting the loss of "consumers" in the baseball card market of the 80s, comic book market of the 90s, oil commodities market of the 00s, etc.
We'll have to wait a few years to make some graphs, but my guess is when everything shakes out, "interest in home consoles" will likely be comparable to somewhere between the PSX/N64 gen and the PS2 gen. As to if that is from "shrinking" or "just casual churn" will be something that will likely be debated for years after.
the ps2 was designed as something more than just a video game console.
I'll take this one step further. Not only was it designed to be more than a game system:
1) at release it was one of the more affordable high end DVD players at $299 (progressive scan output, etc)
2) GTA3 came out less than a year after launch. So you had a system that was already selling to non-traditional gaming folks as an affordable DVD player, and now you had a game that exploded in the mainstream media bring in curious non-traditional gaming consumers.
3) A ton of "non-traditional" games exploded on the market as well bringing in new audiences. Tony Hawk Pro Skater being a big one, and then finally...
4) Guitar Hero. This was arguably the one game that paved the way for Wii more than any other. Here was a "game" that casuals were coming in an "fooling around with" more than they were actually playing. The game showed that "non-geeks" could have fun with gaming consoles without playing Final Fantasy or Mario.
Ultimately, it was the perfect setup for a bubble. Now that it burst (umm.. like 3 years ago) people need to accept that an move on. Did those people move to mobile? Yup. Does that mean the home console market is dead? No, it means that a segment that didn't have much presence in the industry for 20+ years once again doesn't have much presence in the industry.