I think the weather forecast is good from here. So I wouldn't enforce the follow on if the wicket is withering.
It's interesting how it's avoided these days. All stems back to the Australia v India match in 2001. England nearly tripped up at a few years later.
It does feel that way - but actually there's a surprising number. http://www.howstat.com/cricket/statistics/Matches/MatchFollowOn.asp?FollowOn=T&Result=Won - including almost 30 involving England.