I think it's more likely the flood of highly negeative ads on tv, radio, the robocalls and people not seeing much difference between the parties because of pro-corporatist democrats undermining what the democratic party really stands for that is more likely to turn people off.

Canvasing and calling has been a part of politics for many, many years now and everything hasn't fallen apart yet. I'd really argue things started getting worse when the grassroots efforts whithered and the parties turned to mass media instead.