I'm disappointed by them as well, but I certainly wouldn't go all the way back to 2001. They were really on top with the 2004-2006 RM 250 2 strokes and then 2005/2006 RMZ450 with RC racing for them and then that continued with Dungey. The 2006/7/8 RM250 is still one of the best 250 2 strokes.
The RMZ450 (and even RMZ250) were rated near the top around 2011 and 2012. I loved my 2011 RMZ450 and even the RMZ250 was winning shootouts back then.
Once they let Decoster leave and go to KTM was really the turning point and they seemed to start pulling back a little.
I think the Japanese manufactures as a whole (except Yam) really all had big setbacks when they were messing around with the KYB and Showa SFF (single spring) forks and then air forks. It's like a whole generation of red/green/yellow bikes that people wanted to avoid because of the forks.
I think Suzuki is just looking at MX and offroad more from a $$ and business standpoint now and are satisfied to just release bikes at a discounted price. I know the MSRP is near the same as the other brands, but anyone paying MSRP for a Suzuki is just getting swindled as there are always great deals out there on new ones.
Let's all be honest for a minute here. KTM had that huge cash infusion from Peirer and Bajaj around 10-15 years ago. That's when they pursued Decoster and really changed the bike, built out the race team with top riders, and started building their empire and really taking over off-road motorcycling. If that never happened, we all still might be kick starting our MX bikes, pulling our cable clutches, and making fun of guys like Rocket Robin for riding "woods bikes" with no suspension linkage.
But that didn't happen, and Pierer Mobility/Bajaj Auto (commonly known to us as "KTM") really did take over, force the Japanese to take notice and start changing their bikes to compete, and honestly have built some really good bikes!
Suzuki....I don't think they are going anywhere. They are still a huge company worldwide and eventually they will put some focus back into dirt bikes. At least for one year, then let them sit unchanged for another 5 years haha.