I wouldn't be too concerned about it causing anything catastrophic any time soon, at least in regards to housing. It could hurt other discretionary things (cars, pools, vacations, boats) as the Heloc well dries up from bank getting more austere.For real, seems like everybody I know has one, and especially if they did any home repairs. I myself got one with an ARM 10 years ago, and the bank REALLY put effort into getting me to keep it open. Luckily I didn't, and haven't had one since. It's like people can't stop. Even people who bought their houses in 2010-2012, who should be doing awesome right now as far as equity, are still leveraged due to upgrades they financed through a HELOC.
As for housing itself:
Even though our total housing market is worth more than double than the 2007 peak, total US Heloc balances add up to half of what they did in 07'. Even in 07' they played a very minor role in the collapse of housing and the economy. The biggest contributions to that came from the mortgage industry lunacy and inventory levels
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Helocs are currently less than 1% of total housing value.