I think I've put this forward before, but you could argue that Suzuki and Kawasaki were somewhat flattered last year by the majority of Honda and Yamaha riders struggling - certainly compared to how they're doing this year.
http://en.wikipedia.org/wiki/2007_Gr..._racing_season
Tech 3 were backmarkers last year with Sylvain and Makoto Tamada, and now with Michelins and Colin and JT on board they're consistent top 6 contenders.
Jorge Lorenzo has scored three-quarters as many points in 2008 so far as Colin did in the whole of last year on the second factory bike, even including a DNF and a DNS.
Two of the satellite Hondas in 2007, Nakano for JiR (now the Dovi bike, doing well in 2008) and Checa for LCR - still struggling with Randy de P - had a woeful time throughout 2007. Nicky struggled massively in 2007 until Assen - more so than this year arguably. Toni Elias had a bunch of crashes and injuries for Fousto Gresini's team which ruled him out of any contention.
All of that left only Valentino, Dani and Marco doing it for Honda and Yamaha in 07 and chances for Suzuki, Kawasaki and D'Antin to do quite well. In 2008 there are three more fast Yamahas at the front and a couple more Hondas near the pace, which will have knocked the Suzukis and Kawasakis back about four spots in the order, even if their time gap to the top has stayed constant. Loris is riding pretty well but is at the lower end of the top ten, and Chris V hasn't suddenly started riding badly (in 11th this year vs 6th overall last year). That would seem to bear out that things have got more difficult for the smaller teams.
With the best will in the world, I don't think the Kawasaki was a potential winner last year - it hasn't been at any stage since they re-entered in 2002. With Hopkins on board, it's still about as close on pace as Randy was this time last year (although both were/are not consistently on the pace) - the problem being that Westy is now a fair bit slower by comparison which seems to be down to confidence and not being able to get a satisfactory setup. It's the age-old 'thin line between clever and stupid' thing (see also M. Melandri & Ducati).
There's probably a point to this post, but I don't know what it is... :p