Well, I'll give you that re: old regime giving vets a free pass, though I'll add that only the grinding and team-first vets they gave them this much rope.
I also don't have a problem giving the youth a larger role and yeah, give them this over some of the less productive vets. However, we do need to still insulate the youth who aren't there yet. I like Heineman, Mesar and Ylonen for example, but none are ready for a top-6 role and I'd argue a top-9 role is asking a lot. This is a double edge sword as their play-style doesn't lend itself to 4th line minutes.
I get "sending a message" to guys like Drouin and Hoffman, but really, will they get that memo? Both of those examples are players who are who they are. Putting them in the press box won't send a message to them, especially for a team not expected to win.
From a development standpoint, I don't really have any problem with your idea, but we're still rebuilding and it's actually in our best interest to maximize the trade value of Drouin, Dadonov and Monahan specifically. Hoffman though, we should move him at the first opportunity.
It is not realistic to expect rookies to start in a top-6 role.
Suzuki started as 4th line winger. Lecavalier started on the third line, as did Stamkos, Tavares and Hughes.
I think some people are under the impression that if the kids play in Laval and dominate, they will pop into the NHL in a top-6 role right away. That is rarely, rarely how it works. Plekanec is touted as an example of a guy who benefitted from playing in Hamilton. Quite possibily, but he STILL started on the 4th line when he graduated. The AHL is so much weaker than the NHL that dominating the AHL proves almost NOTHING. Hockey history is filled with guys who starred in the AHL and did squat in the NHL. Just in our own world, we know very well Corey Locke, Charles Hudon, Daniel Carr, Laurent Dauphin. There are literally hundreds of guys like that. Playing down can help provide ice time to correct mistakes that were evident higher up, or to rebuild confidence if it was shattered, but a guy who was shattered and unable to handle 4th line NHL duty, is not going to go down, skate around 5 Nate Schnarrs, and come back up to play 2nd line.
A guy like Ylonen can start on the 4th, Heineman 3rd or 4th, Slafkovsky I would put with Suzuki and Caufield just to start building chemistry for the future, but ready to limit Slaf's minutes to about 15 and not expecting top-6 production from him right away. Without pressure to win at all costs, we can develop PROPERLY.
Of course, all this is assuming that in these last 4 exhibitions, we see that the kids actually are better than the vets I am talking about. If not, I agree they should not be given unearned status either.