The V-6 EcoBoost was close, but it did fall short of the V-10's numbers. Ford should see about a V-8 EB engine for the heavier vehicles. This would not just make more numbers, but would help with higher elevations and power loss.
The Ford V-10 is an excellent engine. Yes, it had some issues (spark plugs), but I read virtually zero complaints about it when it comes to reliability these days. It may not have the MPG of a Sprinter, but you can be pretty assured that you will be on the road, not on the side of the road.