InvestAnswers just said something I've been thinking about for a while.

Although paying off my mortgage is something I could do with the BTC gains he pointed out if you borrow against 2-3% it's really (almost) free money considering the massive inflation rate.
Michael Saylor has been talking about the near zero business loans also.
At least mortgages for individuals are still low, unlike ridiculous credit card rates.

Furthermore I believe BTC will go much higher.
A $1 million BTC and even $10 million BTC in the next 5-10-15 years will not surprise me. Well before my mortgage ends anyway.

Also, these free interest loans on furniture etc make sense since you will really pay less over the entire period rather than in 1 chunk today, again due to inflation.