The note should be ... This will close the exploit but NOT get more players to play the Foundry ... simple as that.
People who want to play Foundry play it. People who look for the dilithium will not put the time into playing longer missions. (I personally try to play one long one a week for fun).
That doesn't mean they should leave the exploit. Closing it might not get many, if any, more foundry players, but the exploit should still be closed, like any exploit. The people that do play real foundry missions, every 3 runs they'll get a nice reward. I really don't see a reason for arguing about this other than selfishness.