I don't think there is a viable way to stop increasing development costs but there are a number of options companies can take to reduce the risk associated with them
Most of these options we are already seeing now with the release of DLC and episodic content which will help to bring in extra revenue at relatively very little cost. The milking of franchises which are well established will continue to reduce the risk of creating a 'flop'. I also think that we will start to see more mega publishing/development companies (like EA, Activision) which, having larger cash flows, will be able to absorb the potential loses in creating new IP's. These IP's will then be grown into franchises using the same game engine/design to limit costs and an increasing fanbase to increase sales to make a profit.
Of course, they can always raise the price of games too!









