Most likely, yes. The new high-speed Fyra trains will commence service on the HSL-Zuid line between Amsterdam, Schiphol and Rotterdam-CS this September; when Fyra services are finally extended into Belgium (currently expected in mid 2010), the journey time from Schiphol to Antwerpen Centraal will be cut from 1h50 to just
53 minutes; and Schiphol to Brussel-Zuid will be cut from the current 2h35 to only
1h30, according to
their own figures. KLM is part of the NS Hispeed consortium that will run the high speed service on the new line.
It's expected (or possible) that by 2010, the very short stretches of AF-KLM's short-haul services will be operated solely by train.
Air France already operates a TGV service from Brussels to CDG.