It is hard to know what they will or should do without being certain of the financial intentions/options. If the threshold is inviolate for now, it's about choices.
Would you rather have one Betance at $8 milion or two Pat Neshek/Tommy Hunter types (circa 2016 that is, financially)?
Is it more important to have a proven late-inning reliever than to keep both Velasquez and Pivetta (whether it's as 6th starter or reliever)?
And what about the bench, is it truly set or might they need $1-2 million to fill it out? We don't even know what Harrison's major league salary might be, or if Miller's in the mix.
I don't think the Phillies had any problem recognizing good relievers. They may or may not have overused some guys, but it really is a crapshoot. Overuse a young guy and you say, oh, his body wasn't ready. Overuse an old guy and it's, oh, he didn't have enough miles left. Three years ago I couldn't have told you which of Arano, Rios, Ramos and Morgan would turn into something/have staying power. And it's no easier with all but the best veterans (i.e. your Luis Garcias. To say nothing of a Joely Rodriguez!)
I'm optimistic some of the youth and waiver guys will produce this season; the question marks are more the proven but injured guys.