It's so tempting to just sit in the corner and say "DRM is evil, we don't want to taint the web with it" but unfortunately, as is often the case in the real world, we don't get to make decisions in isolation of their consequences. DRM on the web is already a reality, largely using Flash or Silverlight (see e.g. Hulu, Netflix). However, both of these platforms face problems -- Silverlight in particular seems to have a rather uncertain future, Flash availability on tablets and mobile in general is largely non-existant. The poster asks us to "please use other applications when necessary" - is this really a good answer? That is going to lead to even less interoperability, and I would argue it hurts the web at a time when it's already fighting a serious battle against native apps that generally offer developers better control (of UI, no random GC pauses, actual threading models, etc). It's easy to say "DRM will harm the web", it's a bit harder to foresee what the eventualities of telling people "please go away and use native apps" are.
I expect this is likely not going to be a popular response, but in short please realize that this is not as simple as saying "DRM is bad". Yes, DRM sucks but I'd argue that in the long run, having a hobbled web platform losing out to native apps (see e.g. iOS) is going to suck more.