I don't know. I mean how could I know if I have less space for the tongue, it's hard to judge something like that. It doesn't feel like it. It seems the same to me as before.
I suppose the alveolar ridge is narrower in the bottom jaw, this would be a logical consequence of the extractions and pushing the lower teeth back... But I insist that the mandibular body is the same as before. It's not like the mandibular body will shrink following the extractions. Not unless you're 12 or 13 and you are still growing, I would assume, in which case the mandibular body may grow a bit less in width than it would have otherwise as it will have a bit less impetus to get wider (the bone loss from the extractions). However, I stopped growing ages ago and my mandibular body developed with a full set of teeth in both jaws. Even if there was some narrowing after the extractions, it's imperceptible to me, and trust me, I'm very perceptive. I don't appear in the slightest narrower in my lower face...My gums are also perfectly fine, I can tell that as a fact at least. No evidence of recession whatsoever.
I'm not saying people should jump into extractions easily, but it's not such an evil thing either...especially in many cases where the adult has stopped growing and has fully developed facial bones. I can't say anything about upper jaw extractions, as I haven't had any. I hope this makes sense.