Well, they attribute just about everything else to global warming - why not steeper hills? In fact, I think that corn on my right foot is probably from global warming, too!
I ride an entry level Iron Horse (Cyclone) with a Sora group that I bought about 6 or 7 years ago. I've been thinking of buying a new bike - don't know why - the only person I ride with is my wife and I have no problem keeping up with her on her $2500 Trek. In fact, I tease her that she could have bought 5 of my bikes for what she spent on hers. I guess if I ever start group riding I'll have to get serious with a better bike. We ride 10 to 15 miles a day, usually avg about 15 to 16 mph. So, for now, the ole Iron Horse will do just fine.