I can't speak for PB, but the reason I think it's a good thing is because of several things.
First, to my core I believe Hillary is as insidiously corrupt a politician with no moral compass can be. I truly believe she would sell her daughter if she could get more power or illicit money from it.
Second, I believe both parties need a revolution - Trump, hate him or don't, has changed the Republican party forever and has the potential to do significant good for the country and the part. The democrats need their own revolutionary candidate, as Obama was not the one.
Finally, with majorities in his favor, the country may actually see things done by our government over the next two years (granted, they'll probably suck because lets face it, their politicians). At least we have the potential to see things done though.