I think it depends on whether Bethesda views the negative criticism as damaging their brand. But, as was pointed out to me, sales figures for FO4 are quite rosy, so it may not be an issue. If they do make such an offer, it would likely be at a point in time when the follow-on game release would no longer impact the sales figures. In fact, they could probably make the offer now, given how long it takes to produce such a game.