"New canon" means the canon that will be established by series two, i.e. new stuff that might throw a monkey wrench into all our theories and our fics and so on. I don't define our creativity as a 'problem'. I don't really define new canon as a 'problem', either - it just made me uneasy to think about for a while because I have become quite used to, not to mention quite emotionally invested in some of my ideas and speculations about how the show is going to continue/end, and if the show takes a radically different route I may be disappointed, depending on how well I think the route they choose works. There are quite a few ways the show could end that I can imagine being disappointed by, but, as I said, I am now quite zen about it.

Also, it will be more difficult to keep working on some of my fics, depending on which route the show will take. I don't like having to bend canon too far, unless I'm deliberately writing an alternate universe scenario, and I'm afraid that some of the possible endings for the show could ruin my fics quite thoroughly, or at least make it necessary for me to turn them into radical AUs, which I'm not very eager to do. I like AUs, but I like my AUs to be created by deliberate decision, not caused accidentally by the addition of new canon while I'm still writing. This is why I prefer writing for 'dead' shows, or if I'm writing for 'live' shows, to write 'filler' material that won't conflict with future developments. Unfortunately with Life On Mars I've embarked on several 'post last episode' stories, I really don't know why. But I don't want to abandon them, either.