With how Treliving handled Colborne last year, it's pretty clear he has no interest in another Bouma type situation.
A lot depends on what happens with Brouwer. If he's gone in the expansion draft, I'd fully expect the Flames to throw some money at a winger and/or bottom pairing defenceman in free agency. If not, they have pretty much no choice but to be conservative.
At the moment, the Flames will have 21-23M in cap space minus whatever bonuses Tkachuk and Bennett get. Roughly; 4M for Stone, 6M for goaltending, 5-6M for Bennett+Ferland leaves 5-8M (minus bonuses, so 4-7M?) for 3 defencemen and 2-3 forwards. So in other words, say hello to Kulak, Andersson, Lazar, Hathaway, Jankowski, etc., as full timers. Clearing Brouwer's 4.5M would go a long way in helping management avoid that nightmare scenario of graduating so many deserving prospects to the big league at once.
Hopefully the Flames can clinch quickly so Andersson can get a game in soon; it's the only conceivable reason they'd have kept him up for so long.