I think this whole thing will backfire and sympathy will be with Sanders. Far more than the outcry about debate scheduling, this looks more clearly like a specific attack against the Sanders campaign.
Even though there is no specific evidence that the Clinton campaign was involved, that will be the perception. The Sanders campaign has gone that route, specifically accusing Clinton. This should make for a fun debate. It may be risky, but right now Sanders has to move the needle more than he has so far, so it’s a good gamble.