USB -> Serial adapters are cheap and not a big deal. True, not as convenient as connecting directly without the adapter, but it's not like it's a major problem. I think what's more annoying is that we're not seeing USB connectors on routers and switches vs. legacy serial ports. Although, I rarely come across a router or managed switch or firewall or anything these days that can't just be configured from an ethernet connection.
Lack of a modem in the new Macs... Is that really a problem? Modem sales are pretty low anymore and for most users it's just pointless having it. I personally won't use dial-up internet, can't stand it... There's free WiFi all over the place anymore at most coffee shops, book stores, etc... Who uses a damn modem? Even my brother who lives out in rural nowhere with no high-speed anything available (other than satellite) can't stand dial-up. But his public library has free WiFi and even gives VPN access/accounts for registered members. Fax functionality? OK, I'll buy that... Now even if that's the case, you're still going to want to carry a phone cord with your notebook and it's easy to leave the USB modem (which is about the same size as one of those little inline DSL filters or a line splitter) connected to one end of the phone cord in your bag. I think people are getting a little too picky. But seriously, modems are no longer integrated because the number of people using them is decreasing rather quickly. Fax capability is probably going to be the #1 reason for still having a modem within the next 2~3 years, if it isn't now. But my fax machine is a Brother 7820N all-in-one unit that cost me less than $250 and makes a great B&W laser printer too. I can use it to send faxes from any computer on my network.
OK, it's real late and I'm tired... So I'm probably grumpy and this reads like something typed by a complete ******. Oh, well... I'm still clicking submit and I'm going to bed.