How stupid is it to leave a 3% mortgage rate for current rates?

current situation have a nice, lockup up 20 year mortgage at 3% interest rates. Wife and I found a home that has its appeal for reasons, but the interest rate would be 7% (yikes). We see potential in the home to have it be a long term home, BUT, ouch…it seems silly to leave the low rate and have the high rate and high payment!

What would you do?