Gut feel says yes, though. It's like a microSD in the iPad - it's not missing due to lack of space to put it.
MicroSD slots are pretty small, I'm sure Apple could have tucked one in somewhere if they wanted to.
However, it goes against their business interests to do so - instead they can push overpriced memory upgrades instead. Even Google seems to have caught onto the trend too so it looks like nothing will be changing anytime soon
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If there is no Thunderbolt port and the adaptor doesn't appear to have a Thunderbolt out... is it dead? Would be nice if they'd get the exact type of connectors on all devices across the board. Simplify AC/charging on every product they sell.
Thunderbolt was on life support on launch, killed by USB 3.0, buried and done with USB 3.1.