Anyone believe that international stocks and small cap stocks will eventually make a comeback?

I feel like a moron because my portfolio has been overweight small cap and international stocks for past 20 years.

Obviously the best thing would have been to be 100% in S&P 500 for past 15 years as foreign stocks especially have been dog shit.

Does anyone believe these have any chance of having a 2000-2010 run where these stocks outperform the S&P 500 again?