Well, the thing is, this is exactly what led to the housing crash of '08. Back then it was because the banks were pushing people into it (and then selling the bundled loans as better rated than they were, where inside investors bet on the loans failing). If this is what’s happening now, it’s certainly because the banks are enabling it again. That would be insanely stupid of the banks after what happened in '08, but somehow we’ve gotten stuck in the stupidest timeline, so…
Wikipedia lists Real Clear Politics as having become more conservative and right leaning in recent years. Their polls may not be as accurate.