^Responding to that:
1. That's kind of irrelevant/misleading as the presidential debates haven't started yet. Could Bernie win against Trump or Cruz in a debate? I'm not sure, but it doesn't seem likely. Let's not forget that Carson was coming out ahead of others just a few months ago, and now that ship has swiftly sailed.
2. Let's see how long the political revolution lasts first. In fact, let's see how many people even show up to vote both at the primaries and the general electoin. Let's see if Millenials are really able to put the "walk" in their talk. They are such trend-riders and Bernie is depending on them for his success. If they don't come through, then he won't be able to do anything. Hillary, on the other hand, doesn't alienate middle-of-the-road voters (which is supposedly 33% of total voters) with her policies.
3. A lot of the social programs we have today were implemented back when democrats had control of both the presidency and congress, right? So this is invalid because it can't be applied to today. If anything, it brings us back to problem #2. Also, most beloved?

Maybe because the programs benefit older folks, which have a large turnout in the general elections. So maybe that's why they are seemingly popular. A lot of people complain about having to pay for it.
4. I'm not sure if that argument is true, because even if Bernie's healthcare plan does end up paying off, who's to say that any of his other costly programs wouldn't end up causing citizens to pay more? It's all speculation, as we can't actually predict whether his policies (the ones he manages to implement) will pull through, so I guess this one's a stalemate.
5. I've never heard that argument before.
6. I agree. He's not too old.
Reagan was old. He was older than Bernie during his second term and Republicans
loved him.