[yodsanklai]

The right wing candidate (Fillon) was out of the race due to some financial scandal. The left wing candidate (Hamon) who won the primary wasn't supported by the "left establishement" (who rallied Macron) as he was too much on the left. Macron was also widely supported by the medias, and there was some enthusiasm to have a "fresh" candidate.

He doesn't appeal to conservatives, neither to the left but considering the circumstances it was an easy win for him. I'd say its voter-base are the educated, urban professionals.

[kaesar14]

Will the establishments then turn away from Macron next election, when they can put up more formidable candidates? My American birds-eye view is that Macron is not very popular.

[speedgoose]

There is no establishment. The classic left party just died while the classic right party still hasn't found anyone popular enough to represent them. Macron isn't very popular during his exercice, but it has been like this for French presidents recently. If nothing changes, Macron may very likely win the next election. Things can change fast though.