The reason that we're making changes is because the old views weren't good enough for a ton of people! (They seriously weren't, "this doesn't work on my phone" is the #1 issue people contact us about right now.) So, no, we won't keep the old comment form, because it's never good to have multiple versions (and part of this is combining all the various comment forms, because there are multiple code paths depending on what view you're looking at and that's part of the problem). But we will fix the bugs that people find.