I heard from an F50 pilot that scrapping them is being considered.
nothing about the F70/100 replacement, seems KLM doesn't know what CAN
replace them (my guess is ERJ or CRJ, there isn't any other similar family but as you said KLM is working on fleet consolidation).
KLM never much liked Fokker as you know. This goes back to the big fight between Albert Plesman and Anthony Fokker over the DC-2 which ended with Fokker buying the European production rights for the aircraft which Plesman didn't like at all.
The aircraft were more or less forced on them by the government (no details about the deal, think it had something to do with Schiphol slots) against their will, KLM has a long memory (though it seems to be fading, they vowed to never buy Airbus again when the 310 was replaced ahead of schedule).
For technical reasons, the 733 and 734 are indeed more urgently in need for replacement. 738/9 are the logical choice, but don't rule out the A319/320 yet.
Given the A330 order, there is enough commonality between them for an airline to consider the type. Would give 2 distinct career paths within KLM, 737-767-747/777 and 319/320-330. While not ideal, it may prove better in the long run that having to retrain 737 pilots for the A330. Remember NWA has not only 330s but also large numbers of 320s and 319s, plus if the European merger/partnership/takeover with AF
that's been lurking in the shadows for a few years goes through both of those also operate 319s and 320s in numbers.