I think it would be a really cool feature. But, remember when they added in-game voice chat for fireteams? I've never seen anyone use that personally, but I remember everyone wanting it. I think Bungie might be looking at it like that.
I do think it would be cool though. Warframe's text chat on consoles is great.
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Yeah, that's true. Everyone is usually in parties, however, with text chat everyone would be able to see what you type, and if they don't want to see it Bungie could always add an option to not show text chat at all.