Actually, architecture job prospects have picked up considerably in the past few years. Entry level salary levels are still low compared to other professional degrees.
I’d recommend that @Acuity’s son take a look at Williams. Excellent math and physics and very good studio art (plus excellent art history). Double – and even triple – majoring is common and not a problem. Excellent career and graduate school counselling. Several other small LACs have very good studio art programs, but Williams is especially distinguished for its strength in both art and STM (no engineering, though).