Adapter upon adapter upon adapter. I hate adapters. That's why I absolutely LOVE the old pre-unibody MacBook Pro's, and haven't dropped my Mac Pro for a newer laptop. The old MBP's are still, even by today's standards thin machines, and have the IO for literally everything under the sun. Apple is cutting it's nose off to spite it's face by shoving Thunderbolt down everyone's throats. It's the most expensive form of expansion in the world and even after all of these years the adoption is minimal at best. At least FireWire has 'been there' and 'done that'. There's a GIGANTIC catalogue of accessories made for FireWire, far more than IMHO there will ever be for Thunderbolt. It's a great technology but it's just excruciatingly expensive.
They really aren't. Thunderboltor something like itis where things are going. When the bandwidth gets up higher (perhaps when it's optical rather than copper as originally intended) it's going to more or less supersede PCIe or onboard interfaces for a lot of things. This means that I can have my super thin laptop and hook it up to a real video interface when I need the brawn.
Ignoring that entirely, the reason Firewire is vanishing is because the number of people using it is not exactly expanding on a daily basis. I happen to actually be one of those people but the Firewire over Thunderbolt works... like Firewire.
And the old MBPs have connections for everything? Really? Like USB 3? Or how about we go back: I want my serial and parallel ports. How on earth will I ever connect my MacBook Air to a Cisco router with a serial interface!? (Oh wait, I have an adapter for that too.)
I do not get the freak out over adapters. When I need to pack light, my Air is super thin and awesome. I'm gonna be honest, my USB to serial adapter doesn't come with me everywhere because when I need that, I generally know ahead of time.
The number of people who need to connect to "everything under the sun" is becoming more and more insignificant and even then, between Thunderbolt and USB, I can pretty much connect to everything under the sun. If you work in IT, carry a few adapters in your bag. My Air + adapters is probably still lighter than your Pro and is faster and gets substantially better battery life.
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Man. I was initially excited by the price drop on the base model... and then I looked at it. Ugh. Here's top hoping new models drive the prices down a bit in the used market because I'm definitely looking to replace this original Core Duo (yeah, no "2" in there) Mac Mini I have sitting around the house.