Be it only to WAKE the European bidders UP (!), I welcome this news very favourably. Once more, the Chinese show they're always there to show some dynamism and shake things up a little bit.
A Chinese bid for 2022 I really like the idea of it ! What a bold move ! What a refreshing, unexpected and panache-full initiative in a still universe, full of decorum.
I really started (and finished) to lose interest for the 2022 campaign, after the city that sounded interesting to me at first, Oslo, puzzled me much. I just don't know where they're going, not enough communication, no project behind the bid. I'm afraid I'm more than tepid about Oslo now after backing them in the beginning, and see no more reason to bring my support to them or to any other bidder.
So, though we know the chances are slim, though you might be criticized by people who think only "reasonable" and "logical" bids can be made, great job China.