The foil or the RSX are in my opinion the best contenders for the Olympic spot at this time, although the cost may be around that 10,000 euro mark. As stated before sailors like tommy slingsby are more than happy to blow a similar amount of money on a new laser.
People don't have to start windsurfing on a foil, everyone that windsurfs has learnt on a board that is bare bones and slowly move up to more complex and more expensive prices of kit
its the same with sailing, most junior sailors start on an opti, gain those basic skills needed then move to another boat like a flying 11 or a cheaper laser. Then once they feel their skill level is high enough they buy their 49ers or Nacra 17s

you start on your cheap board (usually your mum or dads LT) then you move onto a techno and then as your sailing skill increases and you start to possibly age out you switch to the likes of RSX, Raceboard and Foiling
Sure tommy slingsby May spend 12500 on a new laser and a normal sailor can't but that normal sailor isn't going to the olympics or sailing in a world title
not everyone is going to the olympics (suprise!) so not everyone needs to buy a foil, they may just be happy to plod around on their LT and that's there choice but the likes of Dorian who is most likely going to the olympics will be able to and willing to fork out that 10,000 Euros to compete on the worlds biggest stage
p.s. a new RSX and a 9.5 kit is around $10,000 what's stopping people from saving for another 6 months and buying a good foil kit????