I'm not sure I buy this. They have the theoretical cap space, but in the past when they had a core of Erik Karlsson and Mark Stone in their primes the owner was on national TV complaining about payroll. It's great that they have the cap space but I'll believe they have the financial might to bring in free agents or trade for expensive players to supplement their core when I see it.
That cap space also isn't going to last for too long once they sign Tkachuk and have to pay Norris next year (and Stutzle + Pinto the year after). Not that it's a bad thing to have lots of good young players, but it's not as if the Sens are in a position to just add 10-15M worth of long term deals as UFAs or through trade, even if ownership was willing to. In general I'm not really all that concerned about the Sens in the short or long term. Short term I don't think they're even an 80 point team this year, and in the long term their ceiling with their young core is probably something like the 16-17 Canadiens skaters without Price. A good team, but not some juggernaut to be looked upon with fear and awe.
They've bottomed out and they're on the way back up, with Tkachuk, Norris, Stutzle, Sanderson, and Pinto as the prime pieces to supplement Chabot who they already had. That's a very nice young core, but Stutzle is the only guy that has real superstar potential, and again I just have zero confidence they're going to spend to appropriately supplement them.