I think the colts will be alright next season, and among the top contenders for the following two seasons.
I agree they will be decent next season (especially if Nygard comes over) and very good the season after (assuming we get Beaudoin back for both seasons).
Trade04/05 Jelsma Nygard
York Beaudoin Patterson
Stewart 1st rounder Moses
Newton Grisolia/Morey Derbidge
Lowe 2nd rounder Dubowsky/Harmon
Aitcheson Akey
Brauti Trade04/05
Tiller Import?/ Passmore
Scott/Handsor 2nd rounder
Hillebrandt
Hrebik
Here's my take on next season I agree with most of your set up:
York (OA)-Jelsma (OA)-Nygard
Moses-Beaudoin-Patterson
Stewart-Grisolia-Derbidge/ (Insert first rounder here). Could also plug in Wigle/Jodoin (OA)
Lowe-Morey-Newton
Dubowsky / (insert 2nd rounder here)
Aitch/Akey
Brauti/Trade hopefully - REALLY wish we didn't give up Savard in the Sale deal...
Passmore/Tiller/Scott
Handsor/Smith
I wonder if Jodoin will stick around, he hasn't had the best season, one of the worst minuses on the team. He has the talent to be explosive but just never really put it all together. Wigle is a workhorse PK/3rd line checker. He could be upgraded. I think Moses and Beaudoin could be beast mode down low next season with Patterson finding soft ice up top for playmaking.
Hopefully the first/second rounders will be decent players.
Team should be really good in two years but will need some better overagers. Morey/Grisolia/Derbidge/Blair are not going to be top end O/A's and it's unlikely Akey back for O/A so HIllebrandt (assuming he is back) will be the only decent one.