Duolingo on console
I'm not a programmer but I don't think it would be hard to make Duolingo into a console application (Xbox One, PS4, etc...). It would not be completely useless either. I would use it on console.
I believe, but could be wrong, that it will soon be available on XBox One. There's an update coming which will allow Windows Apps on the console (some time in the summer) - as there's a Duolingo Windows App (not just the website through a browser), I'd expect/hope that would be included.
The only problem with Duolingo on consoles is that Sony, Nintendo, and Microsoft charge hefty fees for titles that get listed on their digital marketplaces. Given that the console market for Duolingo is nowhere near as big as the mobile/traditional versions, I don't really think that the extra expenses could really be justified.
I am an ametuer programmer and I don't think it would be too hard, but aren't they mostly ror video games, and not language learning sites/programs?