I would be happy. The low end of the intelligence scale have on average pretty bad lives (higher risks of accidents, illness, crime, bad school outcomes, less income and lower life satisfaction), so on purely utilitarian grounds it would be good. But their inefficiency and costs also reduce the overall economy and cost a lot of tax money directly or indirectly. Hence I would be better off with them smarter - it might reduce my competitive advantage a bit, but I think the faster economic growth would balance that. A lot of our market value reside in our unique skills rather than general skills anyway.