Can't miss prospects are unlikely to accept those types of contracts. The whole point of it is for the team to take on risk in exchange for lowering the financial ceiling for the player. If a player is a can't miss type player, they have limited incentive to take that type of deal, especially in an exploding market where even mediocre/injured/etc players can get good life-changing money when they get to free agency.
Disagree that can't miss types are unlikely to accept those offers. Everyone has a number. Springer turned down a 7/$23m contract before his rookie season. They just low-balled him. If that number was $35m then he probably signs and then the Astros still get one cheap FA year. $23m will probably not even cover his arb years much less one FA year.
Or certainly - but I think a key piece of these types of offers is that there's really limited impact on the team if the players don't pan out. Once you start going into the $30-$40MM range, the risk changes. I was more thinking about the cheap flyer type contracts like what they gave Singleton.
I still don't see the Astros, or a lot of other teams, continuing to push to sign guys to extensions without a single MLB AB. While none of these dollar figures would ever cripple a franchise, its still a bigger gamble that a talented, but not elite, prospect is going to flourish at the MLB level. The Altuve-like deals are obviously the ultimate scenario. A young player with MLB experience, but hasn't quite blossomed yet.... but you lock him up anyways, and he ends up exploding.
