Yup, the economy is cyclical, so they'll come down of course. But they can go way higher, too.
Consider this: From 1978 to 1985 (7 years), the federal funds rate was never below 8%, and from 1969 to 1991 (that's 22 years), it only dropped below 6% during the recoveries from recessions.
I think the last 20 years of ZIRP have hoodwinked a lot of people into believing that sub-5% rates are normal. All the people saying rates "have" to come down and that they will therefore have the option to refinance their mortgages are smoking a whole pipe full of copium.
There are structural reasons to think that inflation is baked in for the next decade, and it would be not at all surprising if a mortgage opened today is paid off before rates again drop below 5%.