This sounds like bad news to me. If merc develops a proprietary engine and is looking for margin; it will be overpriced as the current sterndrives and then some. Not only that ... replacement parts for discontinued drives/engines will also increase in price.
Why is it that a (relatively) small company like SEI can sell a drive at 1/3 of what Merc sells it for with all their economies of scale?
We can only hope the likes of SEI will start to manufacture gimbles to match their sterndrives and leave an affordable alternative.
Merc is greedy and likes a semi-monopoly. When too many other choices become available they use their marketshare advantage to eliminate common elements then, stick it to the consumer. I hope their new engine/drive is as successful as the Force L drive!