Jenny, me too - I was rather shocked by the introduction of 'intentionality' - it seemed like it was introducing determinism (even if tacit) and predictability (of sorts) into emergence.
However, I have become fascinated by it, probably because there is lots of work on affordances which talks of objects (and spaces) as being designed with intentionality. Example, a chair is intended to be sat on (doesn't limit the affordances, but it does 'start the conversation' about how it can be used), and a lift in a building is intended to be safe.
So 'learning objects' and 'learning spaces' might be intended for openness, or for compliance (and that might limit or channel the affordances to some extent). In the footprints, where you are - where you start, where you come in (or are invited to come in) to a learning space might push or pull you into certain affordances (scary, comfortable, liminal, etc) - and choice is such a key part of openness (see Stephen Downes autonomy) that you should be able to choose different, or even new uses and affordances in an open learning space.
I too am not certain that I will be comfortable with a 'strong' sense of intentionality in emergence, but I am very interested in exploring is here - at least for a while.