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.
There was some talk here about height taxes, but there's a better solution - redefine shortness as a treatable condition and use HGH to cure it. They even got FDA on board with that, at least for 1.2% shortest people.
Unsatisfactory sexual performance became a treatable condition with Viagra. Depression and hyperactivity became treatable conditions with SSRIs. Being ugly is already almost considered a treatable condition, at least one can get that impression from cosmetic surgery ads. Being overweight is universally considered an illness, even though we don't have too many effective treatment options (surgery is unpopular, and effective drugs like fen-phen and ECA are not officially prescribed any more). If we ever figure out how to increase IQ, you can be certain low IQ will be considered a treatable condition too. Almost everything undesirable gets redefined as an illness as soon as an effective way to fix it is developed.
I welcome these changes. Yes, redefining large parts of normal human variability as illness is a lie, but if that's what society needs to work around its taboos against human enhancement, so be it.